AID18666: Calculate the elasticity of demand for the following data

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AID18666: Calculate the elasticity of demand for the following data:
When the price is Rs 20 per unit, demand for a commodity is 500 units. As the price falls to Rs15 per unit, demand expands to 800 Units
b. From the given demand and supply market equation, Calculate the equilibrium price and quantity.
Qd=400-3Ps
Qs=200+2P

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