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Suppose the demand and supply curves of salt are given by:

Qd=1000−pQ_d = 1000 - p

Qs=700+2pQ_s = 700 + 2p

Find the equilibrium price and quantity.

Solution

✅ Correct Option: 1

Option 1: Equilibrium price = 100, Equilibrium Quantity = 900 -> At equilibrium, quantity demanded equals quantity supplied (Q_d = Q_s). Setting the equations equal: 1000 - p = 700 + 2p, which gives 300 = 3p, so p = 100. Substituting back: Q_d = 1000 - 100 = 900 and Q_s = 700 + 2(100) = 900. Both demand and supply equal 900 units at price 100, confirming this as the market equilibrium. -> correct

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