50.16% is the change from 620 to 931
Calculation steps:
[( 931 - 620 ) ÷ 620] x 100 = 50.16%
Formula
Percentage change = [(931 - 620) / 620] x 100
Subtract the new number by the original number
931 - 620 = 311
311 ÷ 620 = 0.5016129032258064
0.5016129032258064 x 100 = 50.16%