Terry's father loaned her $15,000 for college expenses. Terry agreed to repay the $15,000 in a lump sum 5 years after graduation. No interest was to be charged. Terry, who is now a senior, has the prospects of marrying a rather wealthy man and wishes to repay the loan on graduation day. Assuming that father can invest the money at 12% interest, how much should he be willing to accept on graduation day rather than waiting 5 years for his money? Show your work.