Mashaal Masha
For groups of 25 or more people, a museum charges $\$21$ per person for the first 25 people and $\$14$ for each additional person. Which function $f$ gives the total charge, in dollars, for a tour group with $n$ people, where $n\geq 25$?
Difficulty: Hard
A: 

$f(n)=14n+175$

B: 

$f(n)=14n+525$

C: 

$f(n)=35n-350$

D: 

$f(n)=14n+21$

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