### Own price elasticity and cross price elasticity

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Let the market demand for rye bread be given by  Q = 500 + I - 250Prye + 400Pwheat, where Q is monthly demand in number of loaves, I is average monthly income in dollars, Prye is the price of a loaf of rye bread, and Pwheat is the price of a loaf of wheat bread.  If I = \$1,000, Prye = \$2, and Pwheat = \$3, calculate the following (based on 10% changes in denominators):

(a) the arc price elasticity of demand for rye bread

(b) the arc price elasticity of demand for wheat bread

(c) the arc cross-price elasticity of demand for rye bread

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