given that market demand curve is P(Q)= 815-2Q , market supply curve p(Qs)=10+0.5Qs. In a market equilibrium, Q=322, P= 171, and a price ceiling of $85.50 find the excess demand. i think the answer is 128.25 units but I'm not sure

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given that market demand curve is P(Q)= 815-2Q , market supply curve p(Qs)=10+0.5Qs. In a market equilibrium, Q=322, P= 171, and a price ceiling of $85.50 find the excess demand. i think the answer is 128.25 units but I'm not sure

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