a sum of money at simple interest amounts to rs . 415 in 2 years and to rs . 514 in 4 years . the sum is ?
"explanation : s . i . for 2 years = ( 514 - 415 ) = rs . 99 s . i . for 1 year = 99 / 2 principal = ( 415 - 99 ) = rs . 316 . answer is a"
subtract(415, divide(multiply(subtract(514, 415), 2), 4))