-51.5% is the change from 868 to 421
Calculation steps:
[( 421 - 868 ) ÷ 868] x 100 = -51.5%
Formula
Percentage change = [(421 - 868) / 868] x 100
Subtract the new number by the original number
421 - 868 = -447
-447 ÷ 868 = -0.5149769585253456
-0.5149769585253456 x 100 = -51.5%