Assume the following sales data for a company: 
If 2019 is the base year, what is the percentage increase in sales from 2019 to 2020?
Definitions:
Unit-Elastic
A demand or supply situation where the percentage change in quantity demanded or supplied is equal to the percentage change in price, leading to no change in total revenue.
Price Elasticity
An indicator showing the sensitivity of the demanded quantity of a good to price adjustments, computed by the percentage change in demand relative to the percentage change in price.
Elastic Demand
A demand situation where the percentage change in the quantity demanded of a good or service is greater than the percentage change in its price.
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