It's almost time for Prom! You want to book a limo and are trying to figure out how much it will cost. The limo company charges a flat rate of $200 plus $350 for each hour of use. 5. Write an equation that represents the total cost, y, of renting a limo for x hours. Answer: 6. Using your equation from the last problem, how much would it cost to rent the limo for 4 hours?