find the expenditure on digging a well 14 m deep and of 3 m diameter at rs . 15 per cubic meter ?
"22 / 7 * 14 * 3 / 2 * 3 / 2 = 99 m 2 99 * 15 = 1485 answer : d"
multiply(volume_cylinder(divide(3, const_2), 14), 15)