The terms on an invoice are 4/15, n/30. This means that O a discount of 15% will be allowed if payment is made by the 4th day after the date of the invoice. O a discount of 4% will be allowed if payment is made within 15 days from the date of the invoice. a discount of 15% will be allowed if payment is made with 4 days from the date of the invoice. O a discount of 4% will be allowed if payment is made by the 15th of the month