if a lends rs . 3200 to b at 12 % per annum and b lends the same sum to c at 14.5 % per annum then the gain of b in a period of 5 years is ?
"( 3200 * 2.5 * 5 ) / 100 = > 400 answer : c"
subtract(divide(multiply(multiply(3200, 14.5), 5), const_100), divide(multiply(multiply(3200, 12), 5), const_100))