1000% is the change from 80 to 880
Calculation steps:
[( 880 - 80 ) ÷ 80] x 100 = 1000%
Formula
Percentage change = [(880 - 80) / 80] x 100
Subtract the new number by the original number
880 - 80 = 800
800 ÷ 80 = 10
10 x 100 = 1000%
Example