Sally has no other source of income except for her job at a coffee house that pays $6.50/hour. Since she is such a good worker, her boss lets her choose how many hours she wants to work each week as long as it is between 1 and 20 hours. Assume there are 80 possible hours in a week that can be devoted to leisure or work.

1. Graph her weekly budget constraint.
2. How many hours must Sally work to cover her weekly rent and food expenses that total $91/week?
3. If Sally gets a raise to $7.00/hour but chooses to still work only enough to cover her rent and food expenses, now how many hours must she work?