The consumer demand equation for tissues is given by q = (90 - p)2, where p is the price per case of tissues and q is the demand in weekly sales. (a) Determine the price elasticity of demand E when the price is set at $27. (Round your answer to three decimal places.) E Interpret your answer. The demand is going? by % per 1% increase in price at that price level. (b) At what price should tissues be sold to maximize the revenue? (Round your answer to the nearest cent.) $ (c) Approximately how many cases of tissues would be demanded at that price? (Round your answer to the nearest whole number.) cases per week