HI please assist me with this question. It starts from the first screen shot. Thank you

Use the inform periodic inven merest on long-term loan 15 the information provided below for ic inventory system, to answer question 7: below, for Snow Plumbing Services, which uses the 1 Inventory (1 July 20.7)... Cash purchases.... Credit purchases.... Purchases returns. Freight inwards.... Freight outwards............. Settlement discount received...... Settlement discount granted.... Inventory (31 July 20.8).......... 150 000 15 000 6 000 2 000 1 200 1 800 1 700 2 500 120 000 _) Additional information: The owner of Snow Plumbing Services donated taps and basins to the value of R1 000 to the local crche on 16 June 20.7. No entries regarding this transaction was made in the accounting records of Snow Plumbing Services, yet. ASSIGNMENT 01 (continued) 7. The cost of sales is ... R (1) 47 500 (2) 17 300 (3) 10 300 (4) 19 000 (5) 18 000