925% is the change from 80 to 820
Calculation steps:
[( 820 - 80 ) ÷ 80] x 100 = 925%
Formula
Percentage change = [(820 - 80) / 80] x 100
Subtract the new number by the original number
820 - 80 = 740
740 ÷ 80 = 9.25
9.25 x 100 = 925%
Example