Question

The diameter and height of a cylindrical tank are 7m and 9m respectively . If the inner side of the tank is to be painted all over what will it cost at ₹35 per square metre ?

Answer 1

Solution: Here we are given Diameter=7, it means radius = 7/2 = 3.5 meter. Height =9 meter Total surface area of cylinder = 2πr(h+r) = 2 x 22/ 7 x 7/2 (9 +3.5) =22 x 12.5 = 275 m² Now we will find the cost of it . Cost of 1 m^2 =Rs. 35 Cost of 275 m^2 is cost = 275 x 35= rs 9625