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Math·Algebra·Linear functions

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A painting studio is offering a promotion where the first class is free, the second class is half off the regular price, and the remaining classes are regularly priced. If the regular price of a class is $\$26.40$, which function $f$ gives the total cost, in dollars, of $x$ classes taken using this promotion, where $x\ge 2$?

A

$f(x)=26.40(x-1)+13.20$

B

$f(x)=26.40(x-2)+13.20$

C

$f(x)=26.40(x-1)+13.20(x-2)$

D

$f(x)=26.40(x-2)+13.20(x-1)$