The T4U Shop creates semi-customized t-shirts. The customer selects the color and size of the shirt he or she wants and picks out a graphic design cost T4U five dollars to produce. The owner of the shop, Mr. Jeans, originally priced the shirts at $20, but was disappointed that demas a mas 93 shirts, so he decreased the price to $16 and was happy to find that his sales increased to 145 shirts. T4U is located in a tourist town; however is on a side street that doesn't get as much traffic as shops located on the main drag, so Mr. Jeans is considering handing out free t-shirts to attract more customers. Assuming a linear demand function, how many t-shirts should Mr. Jeans be prepared to give away