if a ' s height is 40 % less than that of b , how much percent b ' s height is more than that of a ?
"excess of b ' s height over a ' s = [ ( 40 / ( 100 - 40 ) ] x 100 % = 66.66 % answer : a ) 66.66 %"
multiply(divide(40, subtract(const_100, 40)), const_100)