Kai, a cash-basis taxpayer, operates a smal bookstore. His records show the following income items for 2020: Sales - Paid, $55,000 Sales - Unpaid, $2,500 Sale of cardboard packaging to recycling company - Paid, $3,175 Sales bonus from publisher - Paid, $1,000. What does Kevin report as his gross receipts on his Schedule C (Form 1040)? $56,000 $59,175 $60,675 $61,675