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The cost of renting a piece of equipment is $\$64n$ for the first day and $\$32n$ for each additional day, where $n$ is a positive integer. Which of the following functions gives the cost $C(x)$, in dollars, of renting this equipment for $x$ days, where $x$ is a positive integer?

A

$C(x)=32nx+32n$

B

$C(x)=32nx+64n$

C

$C(x)=64nx-32n$

D

$C(x)=32n$