Mark works part-time at a grocery store while he is attending college. He earns $18 per hour and makes $432 each week. Mark makes the chart below to show how many hours he works each week. The grocery store is not open on Sundays. After several weeks of working at the grocery storeMark has been able to put $ 790 into his savings account. After he withdrawals $300 for new tires, he decides to start putting 15% of his weekly earnings back into his savings account.