Suppose the market demand for pizza is given by Qd = 300  - 20P and the market supply for pizza given by  Qs =  20P – 100.   Suppose the price of hamburgers, a substitute for pizza, doubles. This leads to a doubling of the demand for pizza (at each price consumers demand twice as much pizza as before). Write the equation of the new market demand for pizza. Find the new equilibrium price and quantity for pizza.

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