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The tennis team is having a fundraiser. They have decided to have a car wash. They are renting a place to wash cars, and the venue costs $250. They also have to buy supplies. They figured out that for each car they wash, it costs them $0.27 per car. They have decided to charge $10 per car when washing cars.

a. Write a system of equations to represent this word problem.

b. Solve the system of equations using any method.

c. Explain how many cars they need to wash in order to start making a profit.