a sum of money at simple interest amounts to rs . 720 after 2 years and to rs . 1020 after a further period of 5 years . the sum is :
"si of 5 year = ( 1020 - 720 ) = 300 so , si of 1 year = 300 / 5 = 60 so , si of 2 year = 60 * 2 = 120 so , sum is = ( 720 - 120 ) = 600 answer : c"
subtract(720, multiply(subtract(1020, 720), const_2.0))