Sept 10 Sold several refrigerators to various customers with the credit terms 3/10, n/60 and bills were sent out as follows:

Jose Mendes $5,000 Amy Thomas 9,500 Nicholas Jay 4,200 Dora Franklin 14,100 Totals $32,800

Sept 20 Received payment (before any applicable discounts) from the following customers for the September 10th sale to be applied to their accounts as follows (Hint: You will need to calculate amount of net cash received from customers):

Jose Mendes $2,900 Amy Thomas 5,400 Nicholas Jay 4,000 Dora Franklin 8,600

I need help with the transaction in Sept 20 how to calculate the discount