The price elasticity of demand for burger is
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the change in the quantity demanded for burger, when burger price increases by 30 paise per rupee
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the percentage increase in the quantity demand for burger, when the price of burger falls by 1% per rupee
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the increase in the demand for burger, when the price of burger falls by 10% per rupee
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the decrease in the quantity demanded for burger, when the price of burger falls by 1% per rupee
Price elasticity of demand measures the PERCENTAGE change in quantity demanded resulting from a 1% price change. Option B correctly states it's a percentage relationship per 1% price change. Option A is wrong because it doesn't use percentages. Option C misses the percentage concept. Option D has the direction wrong (price falling should increase quantity, not decrease it). Elasticity is inherently a ratio of percentages.