Price increases from $10 to $12 and the price elasticity of demand is -0.5. The quantity demanded is 450 units. What was it before?
"E=\\frac{\\frac{Q2-Q1}{Q1}}{\\frac{P2-P1}{P1}}"
"-0.5=\\frac{\\frac{450-Q1}{Q1}}{\\frac{12-10}{10}}"
Q1=500
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