a sum of money at simple interest amounts to rs . 815 in 2 years and to rs . 854 in 3 years . the sum is :
"sol . s . i . for 1 year = rs . ( 854 - 815 ) = rs . 39 . s . i . for 2 years = rs . ( 39 * 2 ) = rs . 78 . â ˆ ´ principal = rs . ( 815 - 78 ) = rs . 737 . answer d"
subtract(815, divide(multiply(subtract(854, 815), 2), 3))