4 Jarome needs to have at least $150 to open his own checking account. He has already saved $30 and plans to earn more money by mowing six lawns this week. Use a piece of paper to write and solve an inequality to determine the minimum amount of money Jarome needs to charge for each lawn he mows this week so he can open his own checking account at the end of the week. Jarome needs to charge at least $___ for each lawn he mows this week.