-3.3% is the change from 848 to 820
Calculation steps:
[( 820 - 848 ) ÷ 848] x 100 = -3.3%
Formula
Percentage change = [(820 - 848) / 848] x 100
Subtract the new number by the original number
820 - 848 = -28
-28 ÷ 848 = -0.0330188679245283
-0.0330188679245283 x 100 = -3.3%