Example $($from #$22$ in the book$)$: Annie Russell, a student at Tech, plans to open a hot dog stand

inside Tech$$s football stadium during home games. There are seven home games scheduled for the

upcoming season. She must pay the Tech athletic department a vendor$$s fee of $$3,000$ for the season.

Her stand and other equipment will cost her $$4,500$ for the season. She estimates that each hot dog she

sells will cost her $$0\mathrm{.}35.$

$1.$ What are her fixed costs?

$2.$ What is her variable cost?