Ed's Print Shop Received an Invoice Dated May 10 for $2,500

Essay

Ed's Print Shop received an invoice dated May 10 for $2,500 with terms 3/10, 1/15, n/60. On May 22, Ed's Print Shop sent a partial payment of $2,000. What is the actual amount that should be credited, and what is Ed's Print Shop's outstanding balance?
Amount credited: $2,020.20; Outstanding balance: $479.80