Formula help, compare amount in two cells

[29kilo]

Thanks in advance for any help:

I want to compare the amounts in two separate columns. If
the amount in cell c4 is less than the amount in cell c6,
then subtract c4 from c6 and put the result in c5 and
color it red.
I know this is simple but I just can't get it to work.
Any help is really appreciated.

 

[CLR]

In C5 put

=IF(C4<C6,C6-C4,0)

Then click on C5 and do Format > Conditional Format > Formula Is > =$C$5>0
and select Format > Patterns > and select Red color > OK > OK

Vaya con Dios,
Chuck, CABGx3