Demand curve q= 10-2p
Price elasticity of demand = -2/3 at price p* how much is p*
The price elasticity of demand at "p^*" is
"\\frac{dQ_Bp^*}{dpQ_B^*} = -2 \\times \\frac{p^*}{10-2p^*} = \\frac{-2}{3} \\\\\n\n3p^* = 10-3p^* \\\\\n\n5p^* = 10 \\\\\n\np^*= 2"
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