If you get 50 cents when you get a certain amount of points, and you do it 21 times, then you can multiply 50 cents and 21 to get your answer. 50 cents is equal to $0.50, which is equal to 0.50. So, multiply 0.50 and 21, and you get 10.5. Add the dollar sign, and you get $10.5. :) I hope this helps. :)
