1000% is the change from 21 to 231
Calculation steps:
[( 231 - 21 ) ÷ 21] x 100 = 1000%
Formula
Percentage change = [(231 - 21) / 21] x 100
Subtract the new number by the original number
231 - 21 = 210
210 ÷ 21 = 10
10 x 100 = 1000%
Example