Arnaldo,

A> A team clean e.g. 450 square meters ( or feets ) for the matter;

A> This team must clean 1.000 square meters.
A> The whole work cost e.g. 80,10 $
A> How to calculate the hours and the hourly rate??

is this a joke?

Ciao
--
Nando Dessena
http://www.flamerobin.org