A retailer of computers decided to purchase a certain model of high-speed printers from a wholesaler and then offer the printers for sale as part of a complete system with its keyboards and computers. Because printing speed was important, the written agreement between the wholesaler and the retailer provided that the printers must be able to print forty pages per minute or more. The wholesaler was to provide 100 printers for the retailer at $300 each. The printers were to be delivered on March 15, and the retailer was to pay for the printers when they were delivered.

When the shipment arrived, the retailer paid for it with a cashier's check for $30,000. However, when the retailer put one of the printers online with its system, it found that the printer was printing at a rate of only thirty pages per minute. The retailer then tested the entire shipment and found that none of the printers met the contract specifications. Although the printers did not meet the specifications, the retailer was under contract with a law firm to deliver 20 systems by April 1. The retailer negotiated with the law firm, and it was agreed that the retailer would install the 20 systems with the printers, but that the retailer would have to deliver by December 20 high-speed printers that met the contract specifications at no extra cost to the law firm, as replacements for these 20 printers. Immediately on making this agreement, the retailer sent an email to the wholesaler of the printers, telling the wholesaler that the shipment did not conform to the contract, but that the retailer was contractually obligated to use 20 of the printers.

Because of the sale of the systems with the nonconforming printers to the law firm, how many printers has the retailer accepted?