Merck produces a widely-used statin called ZOCOR that treats high cholesterol. In
2015 they set the price a $30 per 30-day supply. They sold 500,000 units (30-day supplies)
that year. In 2016, they experimented with lowering the price to $15 per 30-day supply.
They sold 700,000 units that year.
d. What is the elasticity of demand at the 2015 price?
e. What is the elasticity of demand at the 2016 price?