The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of rs 210 per 100 m2.
Radius (r) = 14/2 m = 7 m
Slant height tomb (l) = 25 m
Curved surface area = πrl m2
=(227×25×7) m2
=550 m2
Rate of white- washing = rs 210 per 100 m2
Total cost of white-washing the tomb = rs (550 × 210/100) = rs1155
