Contemporary Mathematics for Business & Consumers 8th Edition by Robert Brechner,Geroge Bergeman

Exercise 80

Ned's Sheds purchases building materials from Timbertown Lumber for $3,700 with terms of 4/15, n/30. The invoice is dated October 17. Ned's decides to send in a $2,000 partial payment.
a. By what date must the partial payment be sent to take advantage of the cash discount
b. What is the net date
c. If partial payment was sent by the discount date, what is the balance still due on the order