A purchase invoice for $1,200 with credit terms 2/10, n/30, and a return of $300 received by the seller prior to payment, is paid within the discount period. A check should be sent for (a) $1,200....

A purchase invoice for $1,200 with credit terms 2/10, n/30, and a return of $300 received by the seller prior to payment, is paid within the discount period. A check should be sent for (a) $1,200.                                    (c) $900.

(b) $882.                                   (d) $810.