Problem: if y is 90 % greater than x , than x is what % less than y ?
Rationale: "y = 1.9 x x = y / 1.9 = 10 y / 19 x is 9 / 19 less which is 47.4 % less than y . the answer is d ."
annotated_formula: multiply(divide(90, add(90, const_100)), const_100)