a number is increased by 20 % and then decreased by 20 % , the final value of the number is ?
"here , x = 20 and y = - 20 therefore , the net % change in value = ( x + y + xy / 100 ) % = [ 20 - 20 + ( 20 x - 20 ) / 100 ] % or - 4 % since the sign is negative , there is a decrease in value by 4 % . answer : d"
divide(multiply(add(20, const_100), subtract(const_100, 20)), const_100)