Put it as a fraction first so it is 240/600. Now all you need to do is get the denominater (600) to 100. Divide 600 by 100 to find out what you need to divide the top by. 600/100= 6. Divide the 240 by 6 to get 40. So the fraction is 40/100 which can then be converted into a percentage. Your answer is 40%.