Problem: the present population of a town is 280 . population increase rate is 10 % p . a . find the population of town after 1 years ?
Rationale: "p = 280 r = 10 % required population of town = p * ( 1 + r / 100 ) ^ t = 280 * ( 1 + 10 / 100 ) = 280 * ( 11 / 10 ) = 308 answer is e"
annotated_formula: add(280, divide(multiply(280, 10), const_100))