Solve the Problem Using the Rule of 78s

Multiple Choice

Solve the problem using the rule of 78s.
-A college student buys a used car for $5000. She makes a down payment of $1,100 and finances the Balance at 8.5% APR over 24 months. Before making the 15th payment, she decides to pay the Remaining balance on the loan. How much interest will the student save?

A) $68.18
B) $53.18
C) $58.49
D) $46.24