Gupta & Grant Computer Supplies usually tries to take advantage of cash discounts even if it must borrow the money for a few days in order to pay the invoice in time. Compute the savings on Gupta & Grant's purchases and terms from two different suppliers. Use a 365-day year. Assume that the number of interest days is the time between the due date and the last date to take advantage of the cash discount.​

When the problem objective is to compare more than two populations, the experimental design that is the counterpart of the matched pairs experiment is called the randomized block design.