Answer:
Production cost is $20 per item.
Step-by-step explanation:
Fixed cost is $100 and 20 items cost $500 to produce.
[tex]C=100+x*production cost[/tex]
[tex]500=100+20*production cost[/tex]
[tex]400=20*production cost[/tex]
Production cost = $20.
So, [tex]C(x)=20x+100[/tex], where C is total cost and x is the number of items produced.