A) Rs. 8448
B) Rs. 9372
C) Rs. 1540
D) Rs. 3180
Correct Answer :Rs. 8448
Explanation :
Base area of cylinder = πr^{2} = 154
r^{2 }= 49
Thus, radius, r = 7
Then, Total Surface Area of cylinder = 2πr(h + r) = 2π*7*(9 + 7)
= 2* 22/7 * 7 *(9 + 7)
= 704
Hence, Cost of painting = 12 * 704
= Rs 8448

A) 1788 m^{3}
B) 1432 m^{3}
C) 1825 m^{3}
D) 588 m^{3}
Correct Answer :1788 m^{3}
Explanation :
volume of a cuboid, V = LBH (L=length, B = breadth, H=height).
ratio of breadth and height =3:2, let breadth=4X and height= X.
As given
3600 = 25 * 4X * X
X2 = 36
X = 6
So, breadth=24 height=6
Total Surface Area = 2(LB + BH + HL)
= 2(25*24 + 24*6 + 6*25)
= 12(25*4 + 24 + 25)
= 12(149)
= 1788
