Using the perpetual system, costing by the last-in, first out method, what is the cost of the merchandise inventory of 30 units on Sep 30?

The inventory data for an item for September are: Sep.1Inventory 4 Solo 10 Purchased 17 Sold 0 Purchased 20 units at $20 10 units 30 units at $25 20 units 10 units at $30 Using the perpetual system, costing by the last-in, first-out method, what is the cost of the merchandise inventory of 30 units on September 30? a. $800 b. $650 c. $750 d. $700