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Which of the following formula determine the income elasticity of demand?:

A. Proportionate change in demand Proportionate change in price

B. Proportional change in the purchase of Y Proportional change in the price of X

C. Proportionate change in demand Proportionate change in income

D. Proportionate change in demand Proportionate change in price

Please do not use chat terms. Example: avoid using "grt" instead of "great".