The manual's correct, you're just misinterpreting it slightly. If the weekly average is 100 pax per day, that means you can't fly more than 200 pax on ANY day. you're taking it to mean you can't average more than 200 pax. For your airline, the weekly demand is 80, that means you can't fly more than 160 pax on a single day. The weekly average only matters for demand, not supply.