198. (p. 422) The following terms appeared on an invoice dated May 20 which was sent by a manufacturer to a retail store: 2/10, net 30. The amount of the invoice was $2,000. Assuming the retailer paid the invoice on June 1 (10 days after the products were delivered), how much should he have paid? A. $1,900 B. $1,800 C. $2,000 L $1,960 E. $2,040