Maddie noticed that many students on campus had t-shirts with greek organization letters or club names on them. recognizing that there was a huge market for this attire, maddie rented a store front and a silk screening machine to get into the t-shirt business. maddie's rent is $1,000 a month, including utilities. the silk screen machine leases for $300 a month. maddie can buy blank t-shirts for $6 each and determined the cost of materials for the silk screening at $2.50 per unit. considering just the figures provided above, how many t-shirts does she need to sell each month to breakeven if she prices the screened t-shirts at $15?