Lacy took out a single payment loan for $610 with a $70 fee. When calculating how much she has to pay by the time the loan matures, you need to add the loan amount and the fee together.
Therefore, Lacy would have to pay:
Loan amount + Fee = Total payment
$610 (loan amount) + $70 (fee) = $680
Therefore, Lacy has to pay $680 by the time the loan reaches maturity. So, the correct answer is:
C. $680
