923.33% is the change from 90 to 921
Calculation steps:
[( 921 - 90 ) ÷ 90] x 100 = 923.33%
Formula
Percentage change = [(921 - 90) / 90] x 100
Subtract the new number by the original number
921 - 90 = 831
831 ÷ 90 = 9.233333333333333
9.233333333333333 x 100 = 923.33%