37.7% is the change from 610 to 840
Calculation steps:
[( 840 - 610 ) ÷ 610] x 100 = 37.7%
Formula
Percentage change = [(840 - 610) / 610] x 100
Subtract the new number by the original number
840 - 610 = 230
230 ÷ 610 = 0.3770491803278688
0.3770491803278688 x 100 = 37.7%