Cash Discounts Tandem Corporation receives a bill from Burl Company for $6,500. The terms of the invoice are 4/10, net 60. The invoice is dated April 30 and states that 1 percent interest per month will be charged starting 60 days after the date of billing if the bill has not been paid.

a. If Tandem pays the bill by May 8, how much must it pay?

b. If Tandem pays the bill on June 7, how much must it pay?

c. If Tandem pays the bill on July 29, how much must it pay?