-86.94% is the change from 421 to 55
Calculation steps:
[( 55 - 421 ) ÷ 421] x 100 = -86.94%
Formula
Percentage change = [(55 - 421) / 421] x 100
Subtract the new number by the original number
55 - 421 = -366
-366 ÷ 421 = -0.8693586698337292
-0.8693586698337292 x 100 = -86.94%