Problem: if annual decrease in the population of a town is 5 % and the present number of people is 40000 what will the population be in 2 years ?
Rationale: population in 2 years = 40000 ( 1 - 5 / 100 ) ^ 2 = 40000 * 19 * 19 / 20 * 20 = 36100 answer is c
annotated_formula: multiply(power(divide(subtract(const_100, 5), const_100), 2), 40000)