Why is this wrong? (Please show work)

Look at the futures listings for corn in Figure 2.11. a. Suppose you buy one contract for May 2015 delivery at the closing price. If the contract closes in May at a price of $3.72 per bushel, what will be your profit or loss? (Each contract calls for delivery of 5,000 bushels.) (Round your answer to 2 decimal places.) Profit v of $ 500 b. How many May 2015 maturity contracts are outstanding? Number of outstanding contracts 51800 FIGURE 2.11 Corn futures prices in the Chicago Board of Trade, September 17, 2014 Source: Data from The Wall Street Journal Online, September 17, 2014. MONTH Dec '14 Mar '15 May '15 Jul '15 Sep '15 Dec '15 LAST 341'6 354'0 3624 3696 377'2 388'2 CHG -20 -1'4 -1'6 -114 -2'0 -1'6 OPEN 3432 355'4 364'0 371'2 378'0 389'4 HIGH 3442 3560 364'2 3712 3780 3900 LOW 339'2 3510 3594 366'6 3750 3854 VOLUME 74580 19416 6153 5171 OPEN INT 796121 201794 51800 76051 20972 99741 1791 3876