84.56% is the change from 421 to 777
Calculation steps:
[( 777 - 421 ) ÷ 421] x 100 = 84.56%
Formula
Percentage change = [(777 - 421) / 421] x 100
Subtract the new number by the original number
777 - 421 = 356
356 ÷ 421 = 0.8456057007125891
0.8456057007125891 x 100 = 84.56%