ABC Corporation uses the perpetual inventory system and had the following inventory transactions during the month of March:

March $1$: Beginning inventory of $500$ units at $$15$ each.

March $5$: Purchased $200$ units at $$16$ each.

March $10$: Sold $400$ units at $$25$ each.

March $15$: Purchased $300$ units at $$17$ each.

March $20$: Sold $350$ units at $$25$ each.

March $25$: Purchased $100$ units at $$18$ each.

March $30$: Sold $150$ units at $$25$ each.

ABC Corporation uses the First$-$In$,$ First$-$Out $($FIFO$)$ method. Calculate the following:

The cost of goods sold $($COGS$)$ for March.

The ending inventory as of March $31.$