the present population of a town is 3456 . population increase rate is 20 % p . a . find the population of town before 2 years ?
"p = 3456 r = 20 % required population of town = p / ( 1 + r / 100 ) ^ t = 3456 / ( 1 + 20 / 100 ) ^ 2 = 3456 / ( 6 / 5 ) ^ 2 = 2400 ( approximately ) answer is a"
add(3456, divide(multiply(3456, 20), const_100))