can you tell me the sales revenue

Some of the information found on a detailed inventory card for Whispering Winds Stationery Ltd. for May is as follows: Received Issued Balance Unit Date No. of Units No. of No. of Cost Units Units May 1 (opening balance) 1,210 $2.90h 1,210 1,100 3.00 2,310 740 1,570 630 3.20 2,200 520 1,680 1,050 3.30 320 2,410 1,100 1,310 1,360 3.40 1,820 850 2,670 1,580 3.60 3,400 1,350 2,050