8.64% is the change from 810 to 880
Calculation steps:
[( 880 - 810 ) ÷ 810] x 100 = 8.64%
Formula
Percentage change = [(880 - 810) / 810] x 100
Subtract the new number by the original number
880 - 810 = 70
70 ÷ 810 = 0.08641975308641975
0.08641975308641975 x 100 = 8.64%