Answer:
a). lower, higher
b). lower, lower
Explanation:
The abatement costs may be defined as the cost that is borne by a firm or an organization when it is necessary to remove any undesirable nuisances or any negative byproducts of the process that is created during the production process. It is cost incurred in eliminating a negative externality such as environmental externality like pollution.
In the context, for solving the pollution abatement cost, the tradeable emissions permits as they are tradebale, an organization with a lower abatement cost sells the permits to the higher abatement cost firms.
Even after selling, the firm still have to reduce the pollution output, then the firm that sold the permit would have lower abatement cost and the negative externality is also reduced at the lower possible cost.
Answer:
b. 10,000.
Explanation:
The number of units completed in April is given by the number of units on April 1st (3,000) added to the number of units started during April (11,000) minus the number of units still in production on April 30th (4,000):

10,000 units were completed during April.
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Answer:
The other criteria could be about the expected delay that is acceptable to customer in the processing time of the server.
Explanation:
If the customers are ready to accept a certain delay then it can help making the decision whether to keep the server permanently on, as it consumes high power.
Also if it is not used all the time then keeping it on all the time would be wastage of resources.
Thus, the scheduling of the expected time at which they use, and the acceptable delay would provide a proper criteria for this.