-89.38% is the change from 320 to 34
Calculation steps:
[( 34 - 320 ) ÷ 320] x 100 = -89.38%
Formula
Percentage change = [(34 - 320) / 320] x 100
Subtract the new number by the original number
34 - 320 = -286
-286 ÷ 320 = -0.89375
-0.89375 x 100 = -89.38%