HELP!! I tried debiting A/R and crediting cash, as well as debiting Merchandise Inventory and crediting cash but they don't work? any other suggestions...

June 28

To fill a ski club special order, Granite Bay Jet Ski purchased, on credit, four additional personal watercraft trailers from Starlight Sports. The invoice list price is $2,000.00 each for the trailers. Credit terms of 1/10, n/30 are offered by Starlight Sports and the total net purchase price (invoice S3488) is $7,920. This order has been shipped FOB destination.

Merchandise listed on the sales invoice:

Item STARLIGHT QUAD

Quantity 4

Stock Number AL900

Net cost per unit $_______

Calculate the net cost per unit and compare your answer to the amount listed by the program when the inventory data is entered