3.9% is the change from 820 to 852
Calculation steps:
[( 852 - 820 ) ÷ 820] x 100 = 3.9%
Formula
Percentage change = [(852 - 820) / 820] x 100
Subtract the new number by the original number
852 - 820 = 32
32 ÷ 820 = 0.03902439024390244
0.03902439024390244 x 100 = 3.9%