-3.19% is the change from 847 to 820
Calculation steps:
[( 820 - 847 ) ÷ 847] x 100 = -3.19%
Formula
Percentage change = [(820 - 847) / 847] x 100
Subtract the new number by the original number
820 - 847 = -27
-27 ÷ 847 = -0.031877213695395513
-0.031877213695395513 x 100 = -3.19%