3) Determine the compound discount on $750 due in 30 months if interest is 8% compounded quarterly. (6) 4) Rob's Rainwear received an invoice dated March 11 with terms 4/10, 2/15, n/30. The amount stated on the invoice was $3900. What is the last day for taking the 2% cash discount? If the invoice is paid on March 13, how much is to be paid? (3)