Hi, Steve

Why not change the formula to :

16 x 115 / 4 x ( 200 - SQR ( 36 000 )) = 5 000 ( exactly 4721. .... ! PbP will return 5060 here ... )

PbP would do that without any pain ... but not very precisely, as you see !!!

Alain

Ok, ... also just look for possible overflows !!!