Answer:
the sum of variable costs and any related opportunity costs
Step-by-step explanation:
They can add this new service given that this condition is met. As long as service revenue is greater than the sum of variable cost and any related opportunity cost. This is because it covers variable expenses.
If the situation is that a new service/division has been added, then the deciding factor would be if the new product or this division can cover for the various variable expenses that was incurred.