CPU (cost per unit), it is very important for the service. How much time you stand for individual clients that are really important. If you are spending too much time, you will get more money. If you are spending a little more time, you will receive less money.instant feedback as to meet clients or customers are not satisfied. When you buy a product, no one gives you more money, however, when someone offers you a service, you can provide them with immediate feedback and help them understand the people who like their service and who is not by giving them more money.
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