18. Figure: Price Decrease and Elasticity $20 10 50 250 If price decreases from $20 to $10, total revenue will: a. decrease by $1,500, so the demand curve is inelastic. b. decrease by $2,500, so the demand curve is inelastic. c. increase by $1,500, so the demand curve is elastic. d. increase by $2,500, so the demand curve is elastic