99.77% is the change from 429 to 857
Calculation steps:
[( 857 - 429 ) ÷ 429] x 100 = 99.77%
Formula
Percentage change = [(857 - 429) / 429] x 100
Subtract the new number by the original number
857 - 429 = 428
428 ÷ 429 = 0.9976689976689976
0.9976689976689976 x 100 = 99.77%