What is t in 336= 214.2(t+3) and 336= 367.2(t)

Sandy works at a clothing store. she makes $7 per hour plus earns 15% commission on her sales. she worked 75 hours over the last two weeks and had a total of $2,566 in sales before taxes. which of the following is closest to how much she will earn in hourly wages and commission for those two weeks?

With this question! what is process of elimination? ? p.s. my brothers acc got banned so add his new one @ yamauchiyamyam17

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?