3.79% is the change from 819 to 850
Calculation steps:
[( 850 - 819 ) ÷ 819] x 100 = 3.79%
Formula
Percentage change = [(850 - 819) / 819] x 100
Subtract the new number by the original number
850 - 819 = 31
31 ÷ 819 = 0.03785103785103785
0.03785103785103785 x 100 = 3.79%