Problem: if each side of a square is increased by 25 % , find the percentage change in its area ?
Rationale: "let each side of the square be a , then area = a x a new side = 125 a / 100 = 5 a / 4 new area = ( 5 a x 5 a ) / ( 4 x 4 ) = ( 25 a ² / 16 ) increased area = = ( 25 a ² / 16 ) - a ² increase % = [ ( 9 a ² / 16 ) x ( 1 / a ² ) x 100 ] % = 56.25 % answer : b"
annotated_formula: square_area(add(const_1, divide(25, const_100)))