Answer:
C) $20 less
Step-by-step explanation:
I have uploaded the graph below.
We can see in the graph that in perfect competition, Jackie will pay $30 dollars for five purses, while in monopoly, she will pay $50 dollars for the same quantity of purses, meaning that she will pay $20 less.
This situation shows one key difference between the two market structures: in perfect competition, prices are lower because they are equal to marginal cost, while in monopoly, prices are higher because they are more than the marginal cost.