Figure: Price Increase and Elasticity Refer to the Figure

Multiple Choice

Figure: Price Increase and Elasticity Refer to the figure. If price increases from $10 to $20, total revenue will:

A) increase by $800 so the demand curve must be inelastic.
B) increase by $100 so the demand curve must be inelastic.
C) decrease by $800 so the demand curve must be elastic.
D) decrease by $100 so the demand curve must be elastic.