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Mark makes a living by painting rooms. Usually, he paints the rooms by himself, finishing the job in $2$ hours and charging $\$100$ total, but sometimes he has an assistant and together they finish painting in $1.5$ hours and charge $\$120$.

If Mark suddenly decides to charge more for his $1.5$ hour jobs, how much more should he charge to ensure that he is making just as much money as he does with solo $2$ hour jobs?

A

$\$20$

B

$\$35$

C

$\$40$

D

$\$80$

E

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