
To determine the net requirement for c, we determine first the number of c’s that are required for the production of a and b given that there are already 25 units of b available.
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  Number of c needed = (50 units of a)(2 c/unit of a) + (60 – 25 units of b)(5 c/unit of b)
     Number of c needed = 275 c’s
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There are currently 160 units of c; hence,
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  Net requirement for c = 275 c – 160 c
   Net requirement for c = 115
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Answer: 115