1. How much would have to be paid on an invoice for $328 with terms of 2/10 ROG if the merchandise invoice is dated January 3, the merchandise arrives January 8, and the invoice is paid (a) January 11; (b) January 25?

2. Find the amount credited and the outstanding balance on an invoice dated August 19 if a partial payment of $500 is paid on August 25 and has terms of 3/10, 1/15, n/30. The amount of the invoice is $826.

3. Campbell Sales purchased merchandise worth $745 and made a partial payment of $300 on day 13. If the sales terms were 2/15, n/30, how much was credited to the account? What was the outstanding balance?