Help inequality problem

On Sunday, Jan. 7, 2007, Rob has $$5$ he saved from his birthday, and he receives his first allowance payment of $$35$. He will continue to receive a $$35$ allowance payment every Sunday. However, starting Jan. 7, 2007, Rob is also responsible for paying for his five lunches each week at $$3$ per lunch and his weekly Saturday movie that costs $$9.50$. If Rob always adds the remainder of his allowances each week to his current savings, after how many total allowance payments will he have enough money to pay for the $$50$ CD player he wants and still be able to cover his expenses for the rest of that week?

Thank you