A school club is selling T-shirts and hats as a fundraiser. The graph above shows the combinations of T-shirts (x-axis) and hats (y-axis) that can be sold to reach a total revenue of $120.00. The point (30, 0) and (0, 20) are on the graph. If a customer buys 6 T-shirts, how many hats can they buy to spend exactly $120.00?
