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14 (10 points) If there are two companies making the same model of cellphones. Assuming the demand for the cellphones produced by Company 1 is

14 (10 points) If there are two companies making the same model of cellphones. Assuming the demand for the cellphones produced by Company 1 is D1, and the demand for the cellphones produced by Compnay 2 is D2, are described by the following two functions: D1=220-P1-(P1-P) D2=180-P2-(P2-P) where P is the average price over the prices of the two companies, i.e., P=(P1+P2)/2. Each company has the cost of C1=C2=10 for producing one cellphone. Suppose each company can only choose one of the three prices {50, 70, 80} for sale. If there is a Nash equilibrium of this game, what is the optimal sale price chosen by Company 1? Type "50", "70" or "80". If there is a Nash equilibrium of this game, what is the optimal sale price chosen by Company 2? Type "50", "70" or "80". If there is a Nash equilibrium of this game, what are the profits at this equilibrium for Company 1? If there is a Nash equilibrium of this game, what are the profits at this equilibrium for Company 2? If the cost for Company 2 changed as C2=20, would the Nash equilibrium change? Type "Yes" or "No

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