"E=\\frac{percentage.change.in.quantity. demanded}{percentag. change.in.price}"
Case 1
"0.5=\\frac{percentage.change.in.quantity. demanded}{40}"
"percentage.change.in.quantity.demanded =\n0.5*40 = 20 percent"
Case 2
"0.5=\\frac{percentage.change.in.quantity. demanded}{30}"
"percentage.change.in.quantity.demanded =\n0.5*30 = 15 percent"
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