Final answer:
Calculating the percentage change in quantity demanded involves dividing the change in quantity by the original quantity.
Step-by-step explanation:
When calculating the percentage change in quantity demanded for a given product, you need to divide the change in quantity demanded by the original quantity demanded and multiply by 100. The formula for calculating the percentage change is:
For example, if the original quantity demanded was 100 units and the new quantity demanded is 120 units, the percentage change would be:
((120 - 100) / 100) x 100 = 20%
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