684.85% is the change from 99 to 777
Calculation steps:
[( 777 - 99 ) ÷ 99] x 100 = 684.85%
Formula
Percentage change = [(777 - 99) / 99] x 100
Subtract the new number by the original number
777 - 99 = 678
678 ÷ 99 = 6.848484848484849
6.848484848484849 x 100 = 684.85%