42 Percentage Calculator

Do you have problems to calculate fast the percentage of other thinks, like money, proportion and other?
Than we have the answer ->
"42 Percentage Calculator"
42 the answer for all!

Calculate fast thinks like:
1. % of number
2. % changed
3. a is b% of
4. % of a part value
5. Increase by %
6. Decrease by %
7. After % deducted
8. After % added
9. Fraction to %

another functions will come, for any ideas Im really open.