-51.16% is the change from 43 to 21
Calculation steps:
[( 21 - 43 ) ÷ 43] x 100 = -51.16%
Formula
Percentage change = [(21 - 43) / 43] x 100
Subtract the new number by the original number
21 - 43 = -22
-22 ÷ 43 = -0.5116279069767442
-0.5116279069767442 x 100 = -51.16%