a) What is the price elasticity of demand for hamburger buns? Please provide a numerical answer. If your answer is decimal, please include all decimal digits. If your answer is negative, please put a negative sign in the front. If your answer is a decimal number between -1 and 1, for example, -0.523, please do not omit the zero (meaning that you should have -0.523 in the answer box, not -.523).

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