821% is the change from 100 to 921
Calculation steps:
[( 921 - 100 ) ÷ 100] x 100 = 821%
Formula
Percentage change = [(921 - 100) / 100] x 100
Subtract the new number by the original number
921 - 100 = 821
821 ÷ 100 = 8.21
8.21 x 100 = 821%
Example