Follow the steps of Sec. 14.4—that is, (1) identify the system, (2) determine whether the process is batch or rate, and so on.
Casein, a dairy product used in making cheese, contains 25% moisture when wet. A dairy sells this product for $40/100 kg. If requested they will dry the casein to 12% moisture. The drying costs are $5/100 kg of water removed. What should the dairy sell the dried product for in order realize the same margin of profit?
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