-93.91% is the change from 345 to 21
Calculation steps:
[( 21 - 345 ) ÷ 345] x 100 = -93.91%
Formula
Percentage change = [(21 - 345) / 345] x 100
Subtract the new number by the original number
21 - 345 = -324
-324 ÷ 345 = -0.9391304347826087
-0.9391304347826087 x 100 = -93.91%