Please be 100% sure before you answer this. Very small exercise. Can someone check if i answered this correct? If not, can you show me the real answer and point out what mistake i did? Also, it shows on the results i have, that the average cost gives the highest net income in this case. What is the argument for that?

I uploaded 2 pictures. One with the question, and the other with the answers i calculated.

And my calculations:

b) Prepare and compare the income statement where the "cost of goods' are calculated unde FIFO, LIFO and average for the data below: A company account record shows sales of 275 units for revenue of $8.500. Operating expenses for 20x5 was $1.500. Inventory records for 20x5: Units cost unit Total cost Jan 01 Beginventory 50 8 400 Jun 15 Purchase 100 7 700 ug 20 Purchase 150 6 900 Oct 15 Purchase 100 5 500