Refer to the Accompanying Table to Answer the Questions $\text { Willingness to Pay for Bottled Water }$

Refer to the accompanying table to answer the questions. $\text { Willingness to Pay for Bottled Water }$
$\begin{array}{lccc}\text { Quantity } & \text { City A } & \text { City B } & \text { City C } \\1 & \$ 20 & \$ 15 & \$ 14 \\2 & \$ 17 & \$ 13 & \$ 13 \\3 & \$ 14 & \$ 11 & \$ 12 \\4 & \$ 11 & \$ 9 & \$ 11 \\5 & \$ 8 & \$ 7 & \$ 10\end{array}$
$\text { Marginal Cost }=\$ 0$
-You are the only provider of bottled water for three cities. Because you have access to a natural spring, the marginal cost to produce an additional bottle is $0. Imagine you could price-discriminate perfectly in this market and that you are a profit-maximizing firm. Calculate how much more profit your firm would earn if you practiced perfect price discrimination instead of practicing imperfect price discrimination (charging different prices in each city) ?

A) $55
B) $30
C) $25
D) $20
E) $10.