Problem: in one year , the population , of a village increased by 10 % and in the next year , it decreased by 10 % . if at the end of 2 nd year , the population was 7920 , what was it in the beginning ?
Rationale: "x * 110 / 100 * 90 / 100 = 7920 x * 0.99 = 7920 x = 7920 / 0.99 = > 8000 answer : b"
annotated_formula: divide(divide(7920, subtract(const_1, divide(10, const_100))), add(const_1, divide(10, const_100)))