Change the shelves

The same workshop, with the stock levels under your control. Watch which rules become binding and which prices switch on.

Try this. Drop the saw time to 25 and watch it acquire a price while another rule loses its own. A rule with capacity to spare is never paid for.

The last column is the one to watch. A row with capacity to spare and a price above zero would break complementary slackness, and no setting of these three sliders can produce one. How many rules get paid varies: two while the workshop builds both products, one when it builds only one.