A factory makes $1100$ units each day. The daily machinery set-up expense is $2000$. The direct material cost for each unit is $3$. Machine operators receive $400$ per day. Each operator is able to produce at most $200$ units per day. What is the average cost per unit?
- A$5.00$
- B$5.18$
- C$6.82$
- D$7.00$