I need the answer for 21 and 23

The following information applies to the questions displayed below Greg's Bicycle Shop has the following transactions related to its top-selling Mongoose mountain bike for the month of March Greg's Bicycle Shop uses a periodic inventory system. Cost per Units Unit Total Cost Date March 1 Beginning inventory March 5 Sale ($240 each) March 9 Purchase March 17 Sale ($290 each) March 22 Purchase Transactions 20 $170 $ 3,400 ,900 10 200 2,000 9 2201.980 $ 9,280 15 10 190 12 March 27 Sale ($315S each) March 30 Purchase Required information 10.00 points Required nventnrv and rost nt onords sold at Marrh 31 usinn the snecific itantification met