-60% is the change from 820 to 328
Calculation steps:
[( 328 - 820 ) ÷ 820] x 100 = -60%
Formula
Percentage change = [(328 - 820) / 820] x 100
Subtract the new number by the original number
328 - 820 = -492
-492 ÷ 820 = -0.6
-0.6 x 100 = -60%
Example