a sum of money at simple interest amounts to rs . 1072 in 2 years and to rs . 1144 in 4 years . the sum is :
"s . i . for 2 years = rs . ( 1144 - 1072 ) = rs . 72 . s . i . for 1 year = rs . 72 / 2 = rs . 36 . principal = rs . ( 1072 - 72 ) = rs . 1000 . answer : option a"
subtract(1072, divide(multiply(subtract(1144, 1072), 2), 4))