61.9% is the change from 420 to 680
Calculation steps:
[( 680 - 420 ) ÷ 420] x 100 = 61.9%
Formula
Percentage change = [(680 - 420) / 420] x 100
Subtract the new number by the original number
680 - 420 = 260
260 ÷ 420 = 0.6190476190476191
0.6190476190476191 x 100 = 61.9%