Stuart, a cash-basis taxpayer, operates a small retail store. His books show the following income items for the year: Sales – paid, $84,357; Sales – unpaid, $1,549; and Sale of cardboard packaging to recycling company, $1,314 – paid. What does Stuart report as his gross income on his Schedule C?a. $87,220b. $85,906c. $85,671d. $84,357