The demand function for a good is Q = 200 - 10P where Q is the quantity and P is the price. Calculate the price elasticity of demand at prices of $5, $10, and $15 (i.e., as the price changes from $5 to $10 and as it changes from $10 to $15) to show how it changes as you move along this linear demand curve. Is the demand for this item price elastic, price inelastic or unit elastic and what does this mean to be price elastic or price inelastic.