Under Your Current Cash Sales Only Policy You Sell 140

Under your current cash sales only policy you sell 140 units a month for a total sales value of $9,660. Your variable cost per unit is $48 and your monthly interest rate is 1.3 percent. Based on a recent survey, you believe that you can sell an additional 25 units per month if you offer a net 30 credit policy. What is the net present value of the proposed switch using the accounts receivable approach?

A) $28,417
B) $28,607
C) $29,525
D) $30,008
E) $30,462