demand and supply, Microeconomics

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the demand and supply functions for goods are given by demand:Pd=50-3Qds and supply:Ps=14=1.5Qs. where p is the price of a pair of jeans, Q is the number of pairs of jeans
a) calculate the equilibrium price and quantity
b)calculate the level of excess supply(Qs-Qd) when P=38
c)calculate the level of excess demand(Qs-Qd) when P=20
d)calculate the profit made on the black market if the maximum price is $20 per pairs imposed

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