Can you please answer this question with its process "step by step" . Thank you

Alphabet Company buys different letters for resale. It buys A Thru J on January 1 at $4 per letter, and sells C on January 15. On February 1, it buys K and L at $6 per letter and sells A and K on February 9. It then buys M thru O on March 1 at $7 per letter and sells F, L, M, N, and O on March 19. If the company uses the LIFO method on a perpetual basis, what is the cost of goods sold for the three months ended March 31 (rounded to the nearest dollar)? $41 $32 $45 $56