A supplier offers credit terms of 2/10, net 30. This means that Multiple Choice all purchases must be paid in full within 20 days. a 2 percent surcharge will be added to any invoice not paid within 10 days. 2 percent of the invoice must be paid within 10 days with the balance paid within 30 days. a monthly interest rate equal to 2/10ths of one percent will be added to any invoice not paid within 30 days. a 2 percent discount can be taken if a purchase is paid within 10 days with the full amount due in 30 days