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Price Elasticity of Demand and its Determinants

AP.MICRO: MKT‑3 (EU), MKT‑3.E (LO), MKT‑3.E.1 (EK), MKT‑3.E.2 (EK), MKT‑3.E.3 (EK), MKT‑3.E.4 (EK), MKT‑3.E.5 (EK)

Problem

When the price of spicy sauce was dollar sign, 10, people bought 100 jars. When the price increased to dollar sign, 12, people only bought 40 jars.
What is the price elasticity of demand for spicy sauce?
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