The cost that a carpet cleaning company charges is directly proportional to the number of rooms cleaned. The cost is $25 for each room.

(a) Write an equation to represent the cost. Show your work!

(b) How many rooms can a hotel pay the company to clean for $200? Write and solve an equation. Show your work!

(c) Suppose the hotel plans to tip the carpet cleaners $25. In that case, how many rooms can the hotel get cleaned for $200? Write and solve an equation. Show your work!