39.57% is the change from 609 to 850
Calculation steps:
[( 850 - 609 ) ÷ 609] x 100 = 39.57%
Formula
Percentage change = [(850 - 609) / 609] x 100
Subtract the new number by the original number
850 - 609 = 241
241 ÷ 609 = 0.3957307060755337
0.3957307060755337 x 100 = 39.57%