1. Saiz buys a Playstation 5 for $500 with a credit card carrying a 21% Annual Percentage Rate (APR) and each month she will pay back $10. By the time she finishes paying off her credit card, what will be the real, total cost of the
Playstation 5?

2. After buying the Playstation 5, Saiz drives home and her tire goes flat. When getting a new tire for her car, she charges $100 on a different credit card carrying an 18% APR and each month she will pay back $5. By the time she finishes paying off her credit card, what will be the real, total cost of the brand new tire?