Delbert’s officemates want to buy a $120 gold watch for a colleague who is retiring. The cost per person is inversely proportional to the number of people who contribute.

1. Express the cost per person, $C\text{,}$ as a function of the number of people, $p\text{,}$ who contribute.
   $=$
2. Sketch the function on the domain $0 \le p \le 20\text{.}$
   
   
   The graph of cost per person is
   (A)
   (B)
   (C)
   (D)
   none of the above