Percentage- Aptitude Questions and Answers - in Hindi

 Due to an increase in the price of eggs by 30%, now 3 less eggs are available for Rs.9.10. The present rate per egg is? अंडे की कीमत में 30% की वृद्धि के कारण, 9 रु  10 पैसे में अब तीन अंडे कम प्राप्त होते है।एक अंडा की वर्तमान कीमत क्या होगी? A) 91 paise B) 70 paise C) 48 paise D) 84 paise Correct Answer :91 paise Explanation :Let the original price of a egg= X New price, 30% increased in the price => (1+30/100)X =>13X/10 according to question 9.10( 1/X - 1/(13X/10) )=3 (9.10/3)(3/13)=X X=9.1/13 So present price of a egg i.e. new price=>13X/10 =>(13/10)(9.1/13) =>.91 44% of the students in the class are females and the number of male students is 42. Find the total number of students in the class? एक कक्षा में 44% विद्यार्थीं लडकियाँ है एवं 42 लड़के हैं। कक्षा में कुल विद्यार्थींयो की संख्या पता कीजिए? A) 70 B) 65 C) 75 D) 45 Correct Answer :75 Explanation :% of females student =44 So % of male students=(100-44)=>56 Let the total number of students=X then 56% of X <=> 56X/100=42 X=4200/56 Therefore total students = X => 75 The price of petrol falls down by 20%. By how much percent must a man increase his consumption, so as to keep his expenditure constant? पेट्रोल के दाम 20 प्रतिशत से कम हो जाताहै। एक व्यक्ति को अपनी खर्च सामान रखने के लिए खपत को कितना प्रतिशत बढ़ाना चाहिए? A) 42% B) 25% C) 20% D) 10% Correct Answer :25% Explanation :Let initial price of petrol =Rs. 100 per ltr Initial monthly consumption =100 ltr Total monthly expenditure =100×100=Rs. 10000 New price of petrol(falls down by 20%)=Rs. 80 per ltr Let new monthly consumption=x ltr New monthly expenditure =80*x to keep monthly expenditure remain constant⇒ 10000=80*x ⇒x=125 i.e., increase in consumption=25% The height of a tree is 800cm and it increases 10% yearly. Find the height of the tree after three years? एक पेड की ऊँचाई 800 सेमी है और इसमें प्रतिवर्ष 10 प्रतिशत की वृद्धि होती है। तीन वर्ष के बाद उसकी ऊँचाई ज्ञात कीजिए? A) 1000 cm B) 1060.4 cm C) 1052.6 cm D) 1064.8 cm Correct Answer :1064.8 cm Explanation :The height of a tree after n yeras , if it increases at the rate of R% per annum= P [1+(R/100)]n Thus, The height of the tree after three years= 800 [1+(10/100)]3 => 800 [11/10]3 => .8*11*11*11 => 1064.8 cm The price of an apple is increased from Rs.50 per kg to Rs.75 per kg. By what percent a person shall need to decrease his consumption in order to have the same expenditure? सेव का भाव 50 रू. प्रतिकिलो से बढ़कर 75 रू. प्रतिकिलो हो गया। किसी व्यक्ति को अपने खर्च को एकसमान रखने हेतु खपत को कितने प्रतिशत से कम करने की आवशयकता है? A) 20% B) 25% C) 16(2/3)% D) 33(1/3)% Correct Answer :33(1/3)% Explanation :Let original consumption = 100 kg and new consumption = x kg, So, 100*50 = x*75 x=200/3 Reduction in consumption (100-200/3)= 100/3 = 33(1/3)% In an examination a candidate who got 30% of the total marks failed by 8 marks. Another candidate who got 35% marks scored 12 marks more than the passing marks. Total marks are? एक परीक्षा में एक परीक्षार्थी जिसे कुल अंको के 30% अंक प्राप्‍त हुए है, 8 अंको से अनुत्तीर्ण हुआ | एक अन्‍य परीक्षार्थी जिसे कुल अंको के 35 % अकं प्राप्‍त हुए है, उसके अकं उत्तीर्ण अंको से 12 अकं अधिक है | कुल अकं है? A) 500 B) 400 C) 800 D) 300 Correct Answer :400 Explanation :Let x be the maximum marks, Then (30% of x)+8 = (35% of x)-12 3*x/10 + 8 = 7*x/20 - 12 3*x + 80 = (7*x - 240)/2 6*x + 160 = 7*x -240 Hence,Minimum marks x=400 The salary of a worker is first increased by 30% and afterwards reduced by 30%. What is the net change in his salary? एक कर्मचारी का वेतन पहले 30 % से बढ़ाया जाता है एवं बाद में 30 % से घटाया जाया है, उसके वेतन में कुल परिवर्तन क्या होगा? A) 91% increase B) 30% decrease C) 9% decrease D) None of these Correct Answer :9% decrease Explanation :Let a original number is = 100 New number, increased by 30% = 100 + (30% of 100) = 130 Now it is reduced by 30% = 130 - (30% of 130) = 91 that means , in net it is 100 - 91 = 9% decreasing Or If something increased by x% and reduced by x% then net effect will be loss of (x/10)2 % = (30/10)2 = 9 % A boy, after giving away 80% of his pocket money to one companion and 6% of the remainder to another, has 94 paise left with him. How much pocket money did the boy have in the beginning(in rupees)? एक लड़के द्वारा अपने एक साथी को अपने जेबखर्च से 80% राशि और एक अन्य साथी को शेष राशि का 6% देने के पश्चात उसके पास 94 पैसे शेष रह जाते है। लड़के के पास प्रारंभ में जेबखर्च के लिए कितनी राशि थी?(रुपये में)? A) 2 B) 2.5 C) 5 D) 10 Correct Answer :5 Explanation :Let the boy had Rs.x Money given to his companion = 80% of x = 4x/5 Remaining money = x - 4x/5 = x/5 Money given to another companion = (6/100)*(x/5) = 3x/250 Remaining money => x/5 - 3x/250 = 94/100 (in rupees) so 47x/250 = 94/100 x = 94*250/100*47 x = 5 (in rupees) If the price of petrol is increased by 25%, by what percent the consumption of petrol must be reduced so that expenditure remains unchanged? यदि पेट्रोल की कीमत में 25% की वृद्धि होती है , तो पेट्रोल की खपत में कितने प्रतिशत की कमी की जाए ताकि व्यय अपरिवर्तित रहे ? A) 20% B) 25% C) 33% D) 50% Correct Answer :20% Explanation :Let initial price of petrol =Rs. 100 per ltr Initial monthly consumption =100 ltr Total monthly expenditure =100×100=Rs. 10000 New price of petrol(increased by 25%)=Rs. 125 per ltr Let new monthly consumption=x ltr New monthly expenditure =125*x to keep monthly expenditure remain constant⇒ 10000=125*x ⇒x=80 i.e., reducedtion in consumption=20% If the price of sugar is decreased by 25%, by what percent the consumption of sugar must be increase so that expenditure remains unchanged? यदि शक्कर की कीमत में 25% की कमी होती है , तो शक्कर की खपत में कितने प्रतिशत की वृद्धि की जाए ताकि ‫व्यय अपरिवर्तित रहे ? A) 20% B) 25% C) 33(1/3)% D) 50% Correct Answer :33(1/3)% Explanation :Let initial price of Sugar=Rs. 100 per kg Initial monthly consumption =100 kg Total monthly expenditure =100×100=Rs. 10000 New price of Sugar(falls down by 25%)=Rs. 75 per kg Let new monthly consumption=x kg New monthly expenditure =75*x to keep monthly expenditure remain constant⇒ 10000=75*x ⇒x=133(1/3) i.e., increase in consumption=33(1/3)% The first class ticket price of a circus is 12. When the price is decreased then the number of visitors increased by 80% and the total income is increased by 20%. Now, what is the price of each ticket? एक सर्कस की प्रथम श्रेणी की टिकिट का मूल्य 12 है। जब मूल्य कम किया गया तो दर्शकों की सं ख्या में 80% वृद्धि हुई और कुल आय में 20% वृद्धि हुई। अब प्रत्येक टिकिट का मूल्य क्या है? A) 8 B) 10 C) 6 D) 15 Correct Answer :8 Explanation :Let 100 was the visitors. On the ticket price 12 the total collection = 12 *100 = 1200 After decreased in price , let it be X. New visitors= 100 + 80% of 100 =>180 New income, total income after 20% increased = 1200 + 20% of 1200=>1440 Therefore, New collection = X * 180 = 1440 => X = 1440/180 thus, Price of each ticket ,X = 8 If M% of x is y and N% of y is x, then ? यदि x का M%, y है और y का N%, x है तब­ ? A) M+N = 100 B) MN = 10000 C) M/N= 100 D) N/M = 100 Correct Answer :MN = 10000 Explanation :Y is M percent of X --> (MX/100)=Y X is N percent of Y --> (NY/100)=X Thus, after subsitute Y's value =>(N/100)*(M/100)*X=X =>MN=10000