Please explain how the answer is 72,000 and please show work!

Cashier's checks Checks Question 5 0/1 pts If Sid Inc. has net sales of $750,000, sales on account of $600,000, and sales returns and allowances of $50,000, what would be the bad debt expense for the year, assuming that Sid uses an estimate of 12% for bad debts? Answer $72,000 $66,000 Answered $90,000 $18,000 1/1 pts Question 6 Net Accounts Receivable is found by subtractingfrom accounts receivable