-47.87% is the change from 821 to 428
Calculation steps:
[( 428 - 821 ) ÷ 821] x 100 = -47.87%
Formula
Percentage change = [(428 - 821) / 821] x 100
Subtract the new number by the original number
428 - 821 = -393
-393 ÷ 821 = -0.47868453105968334
-0.47868453105968334 x 100 = -47.87%