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Cross-Price Elasticity of Demand

AP.MICRO: MKT‑3 (EU), MKT‑3.E (LO), MKT‑3.E.10 (EK), MKT‑3.E.11 (EK)

Problem

When the price of cheese increases by 20, percent, the quantity demanded of sausage decreases by 40, percent.
What is the cross-price elasticity of demand for sausage and cheese?
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