text: # The total cost for 9 bracelets, including shipping was \$72. The shipping charge was \$9. Define your
  
  Discussion in 'Calculator Requests' started by math_celebrity, Mar 3, 2019.
  
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  The total cost for 9 bracelets, including shipping was \$72. The shipping charge was \$9. Define your variable and write an equation that models the cost of each bracelet.
  
  We set up a cost function as fixed cost plus total cost. Fixed cost is the shipping charge of \$9. So we have the following cost function where n is the cost of the bracelets:
  
  C(b) = nb + 9
  
  We are given C(9) = 72 and b = 9
  9n + 9 = 72
  
  Run this through our equation calculator, and we get n = 7.