Increase 120 centimetres by 24%

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%.