You have a car loan. If you pay $417.61 per month, you will pay it off after making 71 payments. If you pay $40 more each month, you will pay it off 7 months sooner. How much total interest will you save?

If you pay the minimum payment per month of $41.21 on your credit card, you will pay it off after making 98 payments. If you pay $10 more per month, you will pay it off 31 months sooner. How much total interest will you save?