61.9% is the change from 210 to 340
Calculation steps:
[( 340 - 210 ) ÷ 210] x 100 = 61.9%
Formula
Percentage change = [(340 - 210) / 210] x 100
Subtract the new number by the original number
340 - 210 = 130
130 ÷ 210 = 0.6190476190476191
0.6190476190476191 x 100 = 61.9%