677.78% is the change from 99 to 770
Calculation steps:
[( 770 - 99 ) ÷ 99] x 100 = 677.78%
Formula
Percentage change = [(770 - 99) / 99] x 100
Subtract the new number by the original number
770 - 99 = 671
671 ÷ 99 = 6.777777777777778
6.777777777777778 x 100 = 677.78%