An invoice dated December 12 is received with a shipment of soccer equipment from England on May 15 of the following year. The list price of the equipment is $2563, with allowed series discounts of 30/20/5. If cash terms of sale are 4/15 ROG, find the amount necessary to pay in full on May 18. The amount necessary to pay in full on May 18 is $ (Round to the nearest cent as needed.)