12 Given QM output on a product-mix problem as below: Objective: Maximize Results ---------- X1 X2 RHS Dual --------------------------------------------------------------------------------- Maximize 40 50 Material A 1 2 <= 40 16 Material B 4 3 <= 120 6 Material C 2 7 <= 300 0 --------------------------------------------------------------------------------- Solution 24 8 1,360 The current dual value (or shadow price) of Material A is 16. If we keep increasing the availability of Material A (which is currently 40) while maintain the others unchanged, then its dual value would ________________ . always remain 16 become 0 at some point keep getting larger and larger become less than 16 but never come to 0 become negative at some point