She should take out a loan with a loan of 5 years period. In the cost and benefit term, it would better to take out the shorter loan period because automobile price tends to decrease in the following year after it has been bought. However, Carmen will not be able to fulfill the 4-year loan payment for each month, because the average auto loan interest rate for a person with 620 credit score is 9.48%. Carmen able to pay 7.72% ((48 x 150)-(8,500-3,000))/(8,500-3,000) interest on 4-year loan and 12.72% ((60 x $150)-($8,500-$3,000))/($8,500-$3,000) on 5-year loan. It would be a safe decision to choose the 5-year loan because Carmen still able to pay the loan interest.