a sum of money at simple interest amounts to rs . 815 in 3 years and to rs . 854 in 4 years . the sum is ?
"s . i . for 1 year = ( 854 - 815 ) = rs . 39 s . i . for 3 years = 39 * 3 = rs . 117 principal = ( 815 - 117 ) = rs . 698 . answer : c"
subtract(815, divide(multiply(subtract(854, 815), 3), 4))