please solve problems 10 and 11 show steps as to how you got the answer for both problems

Styles 10. Brown Bookstore had 250 units on hand at October 1, costing $6 each. Purchases and sales during the month of October were as follows: Date Purchases Sales Oct. 200 @ $12 10 150 @ $7 20 200 @ $8 30 150 @ $16 5 Brown does not maintain perpetual inventory records. According to a physical count, 250 units were on hand at October 31. The cost of the inventory at October 31, under the FIFO method is: a. $1,500. b. $1,950 C. $3,900 d. $4,015. 11. Brown Bookstore had 300 units on hand at May 1, costing $8 each. Purchases and sales during the month of May were as follows: Date Purchases Sales May 14 275 @ $14 17 250 @ $10 25 250 @ $11 29 150 @ $17 Brown does not maintain perpetual inventory records. According to a physical count, 375 units were on hand at May 31. The cost of the inventory at May 31, under the LIFO method is: a. $3,150. b. $3,285. c. $3,650. d. $4,050