Elas table pens What is the price elasticity of demand for pens in the price range R19 to R17?
Price elasticity of demand tends to be %change in quantity demanded of service or good divided by % price change.
"Pe = \\frac{\\frac{(Qd2-Qd1)}{Qd1}}{\\frac{(P2-P1)}{P1}}"
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