The Wildhorse Company sells sports decals that can be personalized with a player's name, a team name, and a jersey number for $9.00 each. Wildhorse's variable costs are the $2.60 it pays its supplier for each decal and $0.50 in operating costs to personalize and sell each decal. The results of last month's operations are as follows: Sales revenue $22,500 Cost of goods sold 6,500 Gross profit 16,000 Operating expenses 6,442 Operating income $9,558