the present population of a town is 1000 . population increase rate is 25 % p . a . find the population of town before 1 years ?
"p = 1000 r = 25 % required population of town = p / ( 1 + r / 100 ) ^ t = 1000 / ( 1 + 25 / 100 ) = 1000 / ( 5 / 4 ) = 800 answer is a"
add(1000, divide(multiply(1000, 25), const_100))