Which of the following can be used to calculate the price elasticity of demand?

A. \(\frac{\text{percentage change in quality demand}}{\text{percentage change in price}}\)  
B. \(\frac{\text{percentage change in price}}{\text{percentage change inquantity demand}}\)
C. \(\frac{\text{percentage change in quality demand}}{\text{percentage change in income}}\)
D. \(\frac{\text{percentage change in income}}{\text{percentage change in quantity demand}}\)

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Correct Answer: A