Partridge Bookstore had 500 units on hand at January 1, costing $9 each. Purchases and sales during the month of January were as follows:Date Purchases SalesJan. 14 375 @ $1417 250 @ $10 25 250 @ $11 29 260 @ $16Partridge does not maintain perpetual inventory records. According to a physical count, 365 units were on hand at January 31.The cost of the inventory at January 31, under the LIFO method is:Partridge Bookstore had 500 units on hand at JanuaThe cost of the inventory at January 31, under the LIFO method is:a.$3,900.b.$3,650.c.$4,015.d.$3,285.