-94.54% is the change from 421 to 23
Calculation steps:
[( 23 - 421 ) ÷ 421] x 100 = -94.54%
Formula
Percentage change = [(23 - 421) / 421] x 100
Subtract the new number by the original number
23 - 421 = -398
-398 ÷ 421 = -0.9453681710213777
-0.9453681710213777 x 100 = -94.54%