Demand Analysis. KRDY-FM is contemplating a T-shirt advertising promotion. Monthly sales data from T-shirt shops marketing the "Listen to KRDY-FM" design indicate that: Q = 15,000 - 800P where Q is T-shirt sales and P is price. A. How many T-shirts could KRDY-FM sell at $15 each? B. What price would KRDY-FM have to charge to sell 5,000 T-shirts? C. At what price would T-shirt sales equal zero? D. How many T-shirts could be given away? E. Calculate the point price elasticity of demand at a price of $15.