Income elasticity of demand can be measured with the help of which of the following formula?
A. $$\frac{{\Delta q}}{{\Delta y}} \times \frac{y}{q}$$
B. $$\frac{{\Delta q}}{{\Delta y}} \times \frac{q}{y}$$
C. $$\frac{{\Delta y}}{{\Delta q}} \times \frac{y}{q}$$
D. $$\frac{{\Delta y}}{{\Delta q}} \times \frac{q}{y}$$
Answer: Option A

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