39.34% is the change from 610 to 850
Calculation steps:
[( 850 - 610 ) ÷ 610] x 100 = 39.34%
Formula
Percentage change = [(850 - 610) / 610] x 100
Subtract the new number by the original number
850 - 610 = 240
240 ÷ 610 = 0.39344262295081966
0.39344262295081966 x 100 = 39.34%