Look at the demand curve in Figure $4\mathrm{.}5\mathrm{.}1.$ If the price of the product is$$ $$4,$ what is the consumer surplus from the $2$nd$$ unit?

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Part $1$

A$.$

$$$$10$

B$.$

$$$$1$

C$.$

$$$$3$

D$.$

$$$$4$

E$.$

$$$$7$