3. Yoshi Yamamura sells silk-screened T-shirts at the multi-culture festival. She estimates that she can sell 600 T- shirts during the weeklong event if she charges $18 each. She also estimates that 750 T-shirts can be sold if she charges only $15 each. (a) Assuming that the demand is linear; determine the demand function that relates the number of T-shirts sold, q, to the price p dollars. (b) Suppose that the supply function of Yoshi's silk-screened T-shirts is described by S: q = 45p-20 Determine the market equilibrium price and quantity. (c) Sketch a graph of the demand and supply function, and identify the market equilibrium point. #3. Yoshi's T-Shirts price per unit