As a business owner, you decide what your cash price should be for each item or SKU on your list of prices. Then, add 4% to your cash price to come up with the credit price. The POS system can do the math for you. Let‘s say a retailer wants to make $20.00 on the sale of a shirt. The cash price is $20.00, and if they accept credit card payments, they will charge $20.00 multiplied by 1.04, or $20.80. The difference between these two prices covers the business owner‘s processing and program fees. When customers check out, the POS keeps track of the total for both cash and credit. After the customer selects their payment method, the POS prints out the itemized receipt with the appropriate prices.