-93.18% is the change from 308 to 21
Calculation steps:
[( 21 - 308 ) ÷ 308] x 100 = -93.18%
Formula
Percentage change = [(21 - 308) / 308] x 100
Subtract the new number by the original number
21 - 308 = -287
-287 ÷ 308 = -0.9318181818181818
-0.9318181818181818 x 100 = -93.18%