Help soon please.

Lucy Company's beginning inventory was 0 and Lucy uses the perpetual inventory method. The following transactions occurred: Purchased on January 1350 units, $10 cost per unit Purchased on January 16150 units, $8 cost per unit Purchased on January 25350 units, $11 cost per unit On January 30, Lucy sold 450 units at a $15 selling price per unit. Assume the LIFO cost flow assumption. Compute GROSS PROFIT for January. Select one: a. $2,100 b. $8,550 c. $4,650 d. $3,900