Donna Pierce manages a business that distributes imported woolen fabrics. Donna's business offers a 2.5% cash discount on any amount paid within 10 days of the invoice date. On January 28, a client purchased fabrics priced at $14,500, and on February 1 the client sent in a $10,000 check. Compute the unpaid balance. (This problem involves the partial payment of an invoice within the discount period.)