Please read my sentences :o)

How many directors must sign the attached bank authorisations?

Besides, I have compared the amounts of balance sheet and income statement items in the audit reports you sent to us with the amounts in the report prepared by our auditor, XXX

and realized that the amounts of balance sheet and income statement items in the audit reports prepared by the auditor,YYY are completely different from the amounts in the report prepared by our auditor, XXX

How did your auditor calculate these amounts ?

Could you please send me the detailed calculation work of the auditor,YYY?