32% of what = 8

I need answers quick... plz help me

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

How far could you drive on 50 gallons of gas

Math it's appreciated. (picture provided)