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Given the demand for trucks is QTD = 500-6PT-2PL+0.04I , where PL is the price of...

Given the demand for trucks is QTD = 500-6PT-2PL+0.04I , where PL is the price of Lego’s, PT is the price of trucks and I is income. PL is 4 and income is 200. The supply function for trucks is given by QTS = -60+2PT . Calculate the price elasticity of demand when the market is in the equilibrium.
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