It is a simple problem where 120 centimeters need to be increased by 24%. The increased length can be found by: 120 * (24/100) = 12 * (24/10) = 288/10 = 28.8 centimeters Then the total length of increase = 28.8 cm Then the increased length = (120 + 28.8) cm = 148.8 cm So the length becomes 148.8 cm after it is increased by 24%.