-41.59% is the change from 820 to 479
Calculation steps:
[( 479 - 820 ) ÷ 820] x 100 = -41.59%
Formula
Percentage change = [(479 - 820) / 820] x 100
Subtract the new number by the original number
479 - 820 = -341
-341 ÷ 820 = -0.41585365853658535
-0.41585365853658535 x 100 = -41.59%