37.1% is the change from 620 to 850
Calculation steps:
[( 850 - 620 ) ÷ 620] x 100 = 37.1%
Formula
Percentage change = [(850 - 620) / 620] x 100
Subtract the new number by the original number
850 - 620 = 230
230 ÷ 620 = 0.3709677419354839
0.3709677419354839 x 100 = 37.1%