Lowery Company uses a perpetual inventory system. The following information is available for the month of March:

Mar. $1$ On hand, $10$ units at $$2$ each $$20$

$4$ Sold $8$ units for $$10$ each $80$

$22$ Purchased $50$ units at $$4$ each $200$

$26$ Sold $48$ units for $$10$ each $480$

If the company uses the FIFO inventory costing method, how much is ending inventory at March $31?$

a$.$ $$8$

b$.$ $$40$

c$.$ $$12$

d$.$ $$16$