I need to know how to add percentages to money value.

Example: 2006 Last quarter sales of $4,000,000, will increase by 3%, 4%, 6% and 5%

Find the % of 4,000,000 then add it to 4,000,000.

For instance, for 3% increase: 4,000,000(.03)=120,000

4,000,000+120,000=4,120,000

That's it.

That's a good method. Another is to use multiplication.
3% = 0.03
So multiply 4000000 by 1.03 = 41200000
4% = 0.04
41200000 x 1.04 = 4284800
6% = 0.06
4284800 x 1.06 = 4541888
5% = 0.05
4451888 x 1.05 = 4768982.4

So the final amount is $4,768,982.40