4.51% is the change from 820 to 857
Calculation steps:
[( 857 - 820 ) ÷ 820] x 100 = 4.51%
Formula
Percentage change = [(857 - 820) / 820] x 100
Subtract the new number by the original number
857 - 820 = 37
37 ÷ 820 = 0.045121951219512194
0.045121951219512194 x 100 = 4.51%