The inner and the outer radii of a circular track are 7 m and 14 m, respectively. Find the cost of levelling the track at the rate of rs. 100 per `m^(2)`.
The following steps are involved in solving the above problem. Arrange them is sequential order
(A) Area of circular track `=pi(R^(2)-r^(2))` and given R = 14 m and r = 7 m
(B) `therefore "Area of circular track"=(22)/(7)(196-49)`
`"(C) Area of the track "=(22)/(7)xx147=22xx21=154cm^(2)`
(D) `"Cost of levelling the path "=462xx100="Rs."46,200`