870% is the change from 80 to 776
Calculation steps:
[( 776 - 80 ) ÷ 80] x 100 = 870%
Formula
Percentage change = [(776 - 80) / 80] x 100
Subtract the new number by the original number
776 - 80 = 696
696 ÷ 80 = 8.7
8.7 x 100 = 870%
Example