-18.05% is the change from 820 to 672
Calculation steps:
[( 672 - 820 ) ÷ 820] x 100 = -18.05%
Formula
Percentage change = [(672 - 820) / 820] x 100
Subtract the new number by the original number
672 - 820 = -148
-148 ÷ 820 = -0.18048780487804877
-0.18048780487804877 x 100 = -18.05%