-96.21% is the change from 343 to 13
Calculation steps:
[( 13 - 343 ) ÷ 343] x 100 = -96.21%
Formula
Percentage change = [(13 - 343) / 343] x 100
Subtract the new number by the original number
13 - 343 = -330
-330 ÷ 343 = -0.9620991253644315
-0.9620991253644315 x 100 = -96.21%