Help!! I'm stuck on these and have no idea what to do!

After two years, how much has been paid into interest?

Ineed if you could explain and give me the answer you! this needs done

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?