Answer:
 the cost should be lower than $2,650 per unit
Step-by-step explanation:
The computation of the maximum contract cost should pay for outsourcing should be 
Variable cost $300 
Avoidable Fixed cost per unit (19,500÷ 10) 1,950 
Opportunity cost (400 ÷ 10) 400 
Total 2,650
Hence, the cost should be lower than $2,650 per unit
This is the answer but the same is not provided in the given options