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