-96.18% is the change from 340 to 13
Calculation steps:
[( 13 - 340 ) ÷ 340] x 100 = -96.18%
Formula
Percentage change = [(13 - 340) / 340] x 100
Subtract the new number by the original number
13 - 340 = -327
-327 ÷ 340 = -0.961764705882353
-0.961764705882353 x 100 = -96.18%