Company Y purchases and sales during a period occur in the following order:

Beginning inventory 3 units @ $390 per unit

Purchase 7 units @ $385 per unit

Sale 5 units

Purchase 4 units @ $380 per unit

Sale 8 units

Purchase 5 units @ $370 per unit

Using LIFO and a perpetual inventory system, the firms cost of sales for the period is:

a. $4,605

b. $6,145

c. $5,145

d. $4,995