Jessica borrowed $500 from a lender that charge simple interest at the rate of 6%. When Jessica paid off her loan, she paid $150 in interest. How long was the loan for in years

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?