if the sides of a rectangle are increased by 15 % , what is the percentage increase in the area ?
"say both sides of the rectangle are equal to 100 ( so consider that we have a square ) . in this case the area is 100 * 100 = 10,000 . the area of new rectangle would be 115 * 115 = 13,225 , which is 32.25 % greater than the old area . answer : a ."
multiply(subtract(power(add(divide(15, const_100), const_1), const_2), const_1), const_100)