The reason for cost's being lower than income: the supplier always postponed providing invoice, thus some of this year's invoices are actually last year's.
The reason why we can't make ends meet is that some of the invoices in this year actually belong to last year's because the suppliers always delay offering us the invoices.
the cause of costing is greater then revenue: The delay of providing invoice by supplier. Part of current invoice should belong to the previous year
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