a certain sum is invested at simple interest at 14 % p . a . for two years instead of investing at 12 % p . a . for the same time period . therefore the interest received is more by rs . 840 . find the sum ?
"let the sum be rs . x . ( x * 14 * 2 ) / 100 - ( x * 12 * 2 ) / 100 = 840 = > 28 x / 100 - 24 x / 100 = 840 = > 4 x / 100 = 840 = > x = 42000 . answer : e"
divide(840, divide(multiply(subtract(14, 12), const_2), const_100))