-95.94% is the change from 320 to 13
Calculation steps:
[( 13 - 320 ) ÷ 320] x 100 = -95.94%
Formula
Percentage change = [(13 - 320) / 320] x 100
Subtract the new number by the original number
13 - 320 = -307
-307 ÷ 320 = -0.959375
-0.959375 x 100 = -95.94%