16.Speedy Rentals charges $300 per month to rent a car plus an initial deposit of $500. Thrifty Rentals charges $200 per month to rent a car plus an initial deposit of $1,000. (a)If you wanted to rent a car for 4 months, which company's cost would be lower? (b)For how many months would you have to rent a car for the price to be the same for both companies?