(Investment): An investor has $150,000 to invest in oil stock,
steel stock, and government bonds. The bonds are guaranteed to
yield 5%, but the yield for each stock can vary. To protect against
major losses, the investor decides that the amount invested in oil
stock should not exceed $50,000. The total amount invested in stock
CANNOT exceed the amount invested in bonds by more than
$25,000.
a) Set up the problem (decision variables, problem constraints,
non-negativity constraints).
b) Now form...