-49.76% is the change from 820 to 412
Calculation steps:
[( 412 - 820 ) ÷ 820] x 100 = -49.76%
Formula
Percentage change = [(412 - 820) / 820] x 100
Subtract the new number by the original number
412 - 820 = -408
-408 ÷ 820 = -0.4975609756097561
-0.4975609756097561 x 100 = -49.76%