of its Amazon Prime shipping and streaming$-$video service from $$79$ to $$99$ per year, a $25\%$ increase. Such a price increase would be the first in this program's nine$-$year history.

Let the figure to the right show the demand for Amazon memberships per year in millions.

Using the letters in the graph $($A$,$ B$,$ and $C$ and $a+$ or sign where appropriate$),$ what area represents Amazon's original revenue, before any price increase?

Amazon's revenue when the price is $$79$ is

Using the letters in the graph $($A$,$ B$,$ and C and $a+$ or sign where appropriate$),$ what area represents Amazon's revenue with the proposed price increase?

Amazon's revenue when the price is $$99$ is

Using the letters in the graph $($A$,$ B$,$ and C and $a+$ or sign where appropriate$),$ how would Amazon's revenue change with the proposed price increase?

If Amazon increases its price from $$79$ to $$99,$ its revenue would change by