99.3% is the change from 430 to 857
Calculation steps:
[( 857 - 430 ) ÷ 430] x 100 = 99.3%
Formula
Percentage change = [(857 - 430) / 430] x 100
Subtract the new number by the original number
857 - 430 = 427
427 ÷ 430 = 0.9930232558139535
0.9930232558139535 x 100 = 99.3%