题目：
The price of product Z decreased from $ 2.50 per unit to 2.00 per unit. Since the price decreased, demand has gone up from 3 million units to 4 million units. Calculate the price elasticity of demand and determine if the demand is elastic or inelastic.Price elasticity of demand Elasticity（）
A. -1.29 elastic
B. -2.00 inelastic
C. -1.29 inelastic
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错
