Ralph advertises to sell cookies for Php 200 a dozen. He
sells 75 dozen and decides that he can charge more. He raises the price
to Php 300 a dozen and sells 45 dozen. What is the elasticity of demand?
The elasticity of demand (PED) is:
"PED=\\frac{\\Delta Q}{\\Delta P}"
where;
"\\Delta Q=\\frac{Q_2-Q_1}{Q_1}=\\frac{45-75}{75}=-0.4"
"\\Delta P=\\frac{P_2-P_1}{P_1}=\\frac{300-200}{200}=0.5"
"PED=\\frac{-0.4}{0.5}=-0.8"
The elasticity of demand is -0.8 that is negative. This means the increase in price leads to decrease in quantity demanded in the market.
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