Based on the amount sold at the various prices for Nibbles, the price elasticity of demand would be -1.
First find the percentage changes in price and quantity sold.
= (New price - Old price) / Old price
= (20 - 16) / 16
= 25%
= (New quantity - Old quantity) / Old quantity
= (30,000 - 40,000) / 40,000
= - 25%
= Change in quantity / Change in price
= - 25% / 25%
= - 1
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