PLEASE BE CAREFULL MAKIN PAYMENTS WITH EXCEL
If you make this operation 850 x 77,1 this is equal to 65.535 but for excel NOOOOOOOOOOOOO
850 x 77,1 = 100.000 !!!!!!!!!
Sorry for this offtopic, but this is the joke of the day.
more info:
hxxp://blogs.msdn.com/excel/archive/2007/09/25/calculation-issue-update.aspx
hxxp://www.joelonsoftware.com/items/2007/09/26b.html