Total cost is represented by = c
Number of necklace is represented by = n
One time cost of tools and start-up materials = $12.50
Cost of making one/per necklace = $3.25
So, equation becomes:
cost = one time cost + 3.25(number of necklace)
[tex]c=12.50+3.25(n)[/tex]
[tex]c=12.50+3.25n[/tex]