-94.06% is the change from 320 to 19
Calculation steps:
[( 19 - 320 ) ÷ 320] x 100 = -94.06%
Formula
Percentage change = [(19 - 320) / 320] x 100
Subtract the new number by the original number
19 - 320 = -301
-301 ÷ 320 = -0.940625
-0.940625 x 100 = -94.06%