You receive an invoice for $18 , 300 with terms of 5/15 , n /60 . If the supplier has a policy of allowing a cash discount for partial payments and you pay $12 , 500 within the discount period, calculate the amount of credit you will receive for this payment. a. 13 , 157.98 b. $13 , 157.89 c. 13 , 175.89