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Math·Algebra·Linear functions

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A dance studio charges an introductory fee for the first $3$ lessons and then charges a fixed fee for each additional lesson. One student took $6$ lessons and was charged $150. Another student took $17$ lessons and was charged $480. Which function $f$ gives the total charge, in dollars, for any student who took $x$ lessons, where $x>2$?

A

$f(x)=25x$

B

$f(x)=25x+55$

C

$f(x)=30x$

D

$f(x)=30x-30$