It's rarely a wrong number — it's a missing one
When a multi-day package underperforms on margin, the cause is rarely a supplier rate entered incorrectly — it's usually a cost that simply wasn't included in the original costing at all: a peak-season transport surcharge, a resort fee added at check-in, a guide's overtime on a longer-than-planned day.
Why these gaps are easy to miss
Costing a six-component package across separate documents (a hotel quote here, a transport quote there) makes it genuinely hard to keep a mental checklist of everything that should be included — the more components, the more likely one gets forgotten under deadline pressure.
Costing against a single package record
The reliable fix is structural: every supplier component should attach to one package record, so the total cost is a sum the system calculates, not a mental tally a person has to keep track of across multiple documents.
How Muhasib prevents this
Muhasib attaches every supplier cost — hotel, transport, guide, activities — to the same package record, so the true landed cost is calculated automatically rather than assembled by memory across scattered documents.