2-25. A farmer estimates that if he harvests his soybean
crop now, he will obtain 1,000 bushels, which he can
sell at $3.00 per bushel. However, he estimates that
this crop will increase by an additional 1,200 bushels
of soybeans for each week he delays harvesting, but the
price will drop at a rate of 50 cents per bushel per week;
in addition, it is likely that he will experience spoilage
of approximately 200 bushels per week for each week
he delays harvesting. When should he harvest his crop
to obtain the largest net cash return, and how much will
be received for his crop at that time? (2.3)