Help please. Thank you very much

Charlie owes Joe $8,000 on a note that is due in five years with accumulated interest at 6%. Joe hat an investment opportunity now that he thinks will earn 18%. There's a chance, however, that it will earn as little as 4%. A bank has offered to discount the note at 14% and give Joe cash that he can invest today. How much ahead will Joe be it he takes the bank s offer and the investment docs turn out to yield 18%? How much behind will he be if the investment turns out to yield only 4%