if rs . 400 amount to rs . 540 in 4 years , what will it amount to in 6 years at the same rate % per annum ?
"80 = ( 400 * 4 * r ) / 100 r = 8.75 % i = ( 400 * 6 * 8.75 ) / 100 = 210 400 + 210 = 610 answer : d"
subtract(multiply(subtract(540, 400), 6), subtract(540, 400))