It is wished to impose the following extra conditions on the food manufacture problem:[3]
The food may never be made up of more than three oils in any month.
If an oil is used in a month at least 20 tons must be used.
If either of VEG 1 or VEG 2 is used in a month then OIL 3 must also be used.
Extend the food manufacture model to encompass these restrictions and find the new optimal solution.