Why order of operations are you using?
I have to say you're even impressing me beyond my wildest imaginations

I can't believe I have to explain this to you again. It's very simple but I'll do it in many different ways so you have choices
Option 1:
40,000 X 0.00008 = 3.2
Option 2:
40,000 X 0.008 = 320
But you still have to move the decimal point (from the % percentage 0.00) which you have to move 2 decimal points to the left giving you wait for it............3.2
Option 3:
If you can't get the answer from doing the simple math above take out your calculator or your phone and open the calculater app and enter the following
1. Enter 40,000 into your calculator
2. Press the / (that's the division sign)
3. Enter 0.008
4. Enter the % (that's the percentage sign)
5. Press = (that's the equal sign)
6. The answer you get should be 3.2
If you do it over again the answer will be the same.
At this point please practice refrain and do not throw your calculator or phone against the wall
Option 4:
If none of the above works in you getting 3.2 from 40,000 X 0.008% and you still do not understand why you have to take the above steps please watch the following video.
Any more questions should be directed at trained professionals.