18. stu owns an ice cream parlor that is usually closed during the winter. this winter, however, stu is considering opening his business in february instead of march. if stu opens his store in february, he will earn total revenue of $4,000 for the month, incurring variable costs of $3,500 and fixed costs of $1,500. if the store remains closed during february, stu will earn no revenues and incur fixed costs of $1,500. stu should: stay closed in february because he will lose $1,000 if he opens. stay closed in february because the $500 of operating profit is insufficient to cover the $1,500 of fixed costs. open in february because the $4,000 of total revenue exceeds the $1,500 of fixed costs. open in february because the $4,000 of total revenue exceeds the $3,500 of variable costs.