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Consumer Surplus: Consumer Surplus for Book of Spells

APMICR-GXBMYR

The maximum price that Harry would have paid for a book of spells is $\$50$, and the maximum Ron would have paid is $\$40$.

They are able to purchase the book for $\$30$. What is their total consumer surplus?

A

$\$10$

B

$\$20$

C

$\$30$

D

$\$40$

E

$\$50$