The demand function for a soda is Q=20-2P , where Q stands for quantity and P for price. a)Calculate point elasticities at prices of 5 and 9. Is the demand curve elastic or inelastic at these points? b)Calculate are elasticity at the interval between  P=$5 and P=$6. c)At which price would a change in price  and quantity result in approximately no change in total revenue? Why?

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