Demand contracts from 500 to 400 when price rises from $40 to $42
"PED= \\frac{\\Delta Q}{\\Delta P}\u00d7\\frac {P}{Q}"
"= \\frac{(400-500)}{(42-40)}\u00d7\\frac {P}{Q}"
"= \\frac{-100}{2}\u00d7\\frac {40}{500}= -4"
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