Originally Posted by Seerah
Well, using proportions is just one method of finding percents. The other way is this:
Code:
portion = whole * %
(where your percent is converted to a decimal by %/100.)

You make this so difficult!
Here is my elite steps to subtracting/adding percentage.
1. pull out smart phone
2. slide finger to unlock
3. enter encryption code (I'm an IT nut)
4. slide finger left 2 times
5. select "calculator" app
6. enter first number
7. hit add/subtract as necessary
8. enter second number (the percentage add or removed)
9. hit % key
10. hit = key
11. laugh at the fact I did it in nanoseconds
OK, in all seriousness, our CPA at my office can literally do this in his head in second. I mess with him all the time "Hey bob, what's 20% off 1448.74"  BAM answer. Of course I don't need it.