Can I see the math as to how we get the correct answer?

AT&T offers you a new cell phone for free, but you must sign a two year agreement at $62.68 per month. Alternatively you can purchase the phone outright and pay $41.97 per month for connenction and data. If the annual interest rate is 4.500% how much are you paying for your phone when you sign the two year agreement? Type: Calculated Points Awarded: 0/1 Your Answer(s): $ 167.07 Correct Answer(s): $ (correct) $474.48