So many...!
Just a few uses in everyday life include working out sums like; VAT, use it to work out interest, you can also use it to work out things like what an item of clothing would be in a 20%/30%...off sale?!...
math
if your trying to show percentage and not change in percentage u use a pie graph
The use of percentage shows the progress or share of a certain data against other data.
25%
66%
%750,000,000
Which bank offer the best interest percentage on checking accounts?
3%
8%
65%
20%
92%