-61.46% is the change from 820 to 316
Calculation steps:
[( 316 - 820 ) ÷ 820] x 100 = -61.46%
Formula
Percentage change = [(316 - 820) / 820] x 100
Subtract the new number by the original number
316 - 820 = -504
-504 ÷ 820 = -0.6146341463414634
-0.6146341463414634 x 100 = -61.46%