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A museum charges $6 per person for a guided tour with a group of 1 to 11 people or a fixed $72 fee for a group of 12 or more people. Write a function relating the number of people, n, to the cost, C.

` C(n)= {( ),( ),( ):}`   if `0<n <`
  if `n≥`

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   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
log logn ln n  | | e 
sin cos tan arcsin arccos arctan  
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