Refer to Example. The first problem solved in Example left the end-point restrictions at 0-200,000 t for both coal piles at the end of the 3-week period. Resolve the first problem V1 (1)=70, 000 and V2 (1)=70, 000 with the added restriction that the final volume of coal at plant 2 at the end of the third week be at least 20,000 t.

Example
We are given two coal-burning generating units that must both remain on-line for a 3-week period. The combined output from the two units is to supply the following loads (loads are assumed constant for 1 week).