-40.61% is the change from 820 to 487
Calculation steps:
[( 487 - 820 ) ÷ 820] x 100 = -40.61%
Formula
Percentage change = [(487 - 820) / 820] x 100
Subtract the new number by the original number
487 - 820 = -333
-333 ÷ 820 = -0.4060975609756098
-0.4060975609756098 x 100 = -40.61%