-40.68% is the change from 821 to 487
Calculation steps:
[( 487 - 821 ) ÷ 821] x 100 = -40.68%
Formula
Percentage change = [(487 - 821) / 821] x 100
Subtract the new number by the original number
487 - 821 = -334
-334 ÷ 821 = -0.40682095006090135
-0.40682095006090135 x 100 = -40.68%