John wants to earn money this summer by maintaining gardens and lawns. He would have variable costs for each job of $ 2 for supplies. To be compet-itive, he can charge $ 22 per job, and would be able to maintain at least 80 jobs. ( a) To break even, what is the most he could pay for equipment? ( b) If John wanted to make $ 900, what is the most he could pay to purchase his equipment?