1100% is the change from 21 to 252
Calculation steps:
[( 252 - 21 ) ÷ 21] x 100 = 1100%
Formula
Percentage change = [(252 - 21) / 21] x 100
Subtract the new number by the original number
252 - 21 = 231
231 ÷ 21 = 11
11 x 100 = 1100%
Example