98.1% is the change from 421 to 834
Calculation steps:
[( 834 - 421 ) ÷ 421] x 100 = 98.1%
Formula
Percentage change = [(834 - 421) / 421] x 100
Subtract the new number by the original number
834 - 421 = 413
413 ÷ 421 = 0.9809976247030879
0.9809976247030879 x 100 = 98.1%