110% is the change from 10 to 21
Calculation steps:
[( 21 - 10 ) ÷ 10] x 100 = 110%
Formula
Percentage change = [(21 - 10) / 10] x 100
Subtract the new number by the original number
21 - 10 = 11
11 ÷ 10 = 1.1
1.1 x 100 = 110%
Example