The consumer demand equation for tissues is given by
q = 11,449 −214 p +p²,
where p is the price per case of tissues and q is the demand in weekly sales.
Determine the price elasticity of demand E when the price is set at $21. (Round your answer to three decimal places.)
E =
When the price is set at $21, the demand is going down by _________ % per 1% increase in price.