Asecondhand car costs £2400 the price falls by 45% when it is sold again how much is it sold for?

In this question you are just figuring out 45% of 2400. To do this, you can halve 2400 to get 1200 which is 50%. Then, if you divide 2400 by 10 to get 240, and then divide by 2 to get 120, that is 5%. You can then just do 1200 - 120 = £1080, which is your answer