One and three hundred twenty four thousandths in decimal form

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

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?

I’m stuck on this equation, anyone got the answer?