Assume that the market demand for rye bread be given by Q = 500 + I – 250 Prye + 400P_{wheat}, where Q is the monthly demand in number of loaves, I is the average monthly income in dollars, Prye is the price of the loaf of rye bread and P_{wheat} is the price of the loaf of wheat bread. If I = $1,000, Prye = $2 and Pwheat = $3, compute the given (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 the demand for rye bread.