what is the % change in the area of a rectangle when its length increases by 25 % and its width decreases by 25 % ?
"( 125 / 10 ) * ( 75 / 10 ) = 9375 / 100 ~ 94 of original area 0.94 is a 6 % decrease from 100 / 100 - > d"
subtract(const_100, divide(multiply(add(const_100, 25), subtract(const_100, 25)), const_100))