A single-price monopolist has a demand curve with a constant slope of -5 and an intercept of 50. If it drops its price by 5 units, we can be sure that
a. sales will increase by 5 units.
b. marginal revenue will decrease by 5 units.
c. marginal revenue will be less than it was before.
d. none of the above are true.
Answer: c. marginal revenue will be less than it was before.