899% is the change from 100 to 999
Calculation steps:
[( 999 - 100 ) ÷ 100] x 100 = 899%
Formula
Percentage change = [(999 - 100) / 100] x 100
Subtract the new number by the original number
999 - 100 = 899
899 ÷ 100 = 8.99
8.99 x 100 = 899%
Example