100.48% is the change from 419 to 840
Calculation steps:
[( 840 - 419 ) ÷ 419] x 100 = 100.48%
Formula
Percentage change = [(840 - 419) / 419] x 100
Subtract the new number by the original number
840 - 419 = 421
421 ÷ 419 = 1.0047732696897376
1.0047732696897376 x 100 = 100.48%