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Units for P'(x)

APCALC-INXIHC

The graph of $P(t)$ below shows the profit in dollars earned by Bea's Busy BBQ, where $t$ is the number of months since Bea opened for business.

What are the units of $P'(t)$?

A

dollars

B

months

C

$\cfrac{{{\rm{dollars}}}}{{{\rm{month}}}}$

D

$\cfrac{{{\rm{100 }}\,{\rm{dollars}}}}{{{\rm{3 }}\,{\rm{months}}}}$