July $17$ Purchased $50$ watches for $$7,500($$$150$ per watch$)$ on account.

July $31$ Sold $40$ watches for $$20,000$ cash.

August $12$ Purchased $40$ watches for $$6,400($$$160$ per watch$)$ cash.

August $22$ Sold $30$ watches for $$15,000$ on account.

September $19$ Paid for watches purchased on July $17.$

September $27$ Receive cash of $$9,000$ for watches sold on account on August $22.$

October $27$ Purchased $80$ watches for $$13,600($$$170$ per watch$)$ cash.

November $20$ Sold $90$ watches for $$45,000$ cash.

December $4$ Purchased $100$ watches for $$18,000($$$180$ per watch$)$ on account.

December $8$ Sold $40$ watches for $$20,000$ on account.

Required:

$1-$a$.$ Calculate sales revenue, cost of goods sold, and ending inventory as of December $31,2025,$ assuming Suzie uses a FIFO perpetual inventory system to account for inventory.

$1-$b$.$ Prepare the gross profit section of a partial income statement for transactions related to MU watches