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If M% of x is y and N% of y is x, then ? |
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 |
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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? |
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
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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? |
A) 70
B) 65
C) 75
D) 45
Correct Answer : 75 Explanation : % of females student =44 |
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? |
A) 42%
B) 25%
C) 20%
D) 10%
Correct Answer : 25% Explanation : Let initial price of petrol =Rs. 100 per ltr New price of petrol(falls down by 20%)=Rs. 80 per ltr to keep monthly expenditure remain constant⇒ 10000=80*x 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? |
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 |
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? |
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, |
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? |
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 6*x + 160 = 7*x -240 |
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The salary of a worker is first increased by 30% and afterwards reduced by 30%. What is the net change in his salary? |
A) 91% increase
B) 30% decrease
C) 9% decrease
D) None of these
Correct Answer : 9% decrease Explanation : Let a original number is = 100 that means , in net it is 100 - 91 = 9% decreasing
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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)? |
A) 2
B) 2.5
C) 5
D) 10
Correct Answer : 5 Explanation : Let the boy had Rs.x |
If the price of petrol is increased by 25%, by what percent the consumption of petrol must be reduced so that expenditure remains unchanged? |
A) 20%
B) 25%
C) 33%
D) 50%
Correct Answer : 20% Explanation : Let initial price of petrol =Rs. 100 per ltr New price of petrol(increased by 25%)=Rs. 125 per ltr to keep monthly expenditure remain constant⇒ 10000=125*x i.e., reducedtion in consumption=20% |
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If the price of sugar is decreased by 25%, by what percent the consumption of sugar must be increase so that expenditure remains unchanged? |
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 New price of Sugar(falls down by 25%)=Rs. 75 per kg to keep monthly expenditure remain constant⇒ 10000=75*x 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? |
A) 8
B) 10
C) 6
D) 15
Correct Answer : 8 Explanation : Let 100 was the visitors. After decreased in price , let it be X. Therefore, New collection = X * 180 = 1440 thus, Price of each ticket ,X = 8 |
Out of the total production of iron from hematite, an ore of iron, 20% of the ore gets wasted, and out of the remaining iron, only 25% is pure iron. If the pure iron obtained in a year from a mine of hematite was 80,000 kg, then the quantity of hematite mined from that mine in the year is? |
A) 500000 kg
B) 400000 kg
C) 450000 kg
D) 550000 kg
Correct Answer : 400000 kg Explanation : Let 100 kg of hematite be obtained then 20% of it get wasted that means 80 kg of ore remains. |
The total population of a country is 294000, out of which 150000 are males. Out of every 100 males, 98 can read and write, but only 53% of the total population can do so. Find the percentage of women who can read and write? |
A) 6.125 %
B) 5.125 %
C) 6.000 %
D) 4.125 %
Correct Answer : 6.125 % Explanation : Number of men who can read and write = 150000 × (98 ÷ 100) =147000 |
68% of a number is 280 more than 43% of the same number. Find the number? |
A) 1120
B) 1210
C) 1200
D) 1800
Correct Answer : 1120 Explanation : The difference in percentage = 68% - 43% = 25% |
The population of a town is 100000. If it increases at the rate of 5% per annum, what will be the population of the town after 2 years? |
A) 11000
B) 110000
C) 110250
D) 11025
Correct Answer : 110250 Explanation : If the present population of the town is P now and it increases at the rate of R% per annum, then: The population after 2 years= 100000 [1+(5/100)]2 |
When the price of an item decreased by 20%, the number of items sold increased by 30%. What was the percentage increase on the total revenue? |
A) 20%
B) 6%
C) 5%
D) 4%
Correct Answer : 4% Explanation : Let cost of each item = Rs.100 & sale = 100 item . |