Help pls, stuck on this

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

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?  

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?