-70% is the change from 320 to 96
Calculation steps:
[( 96 - 320 ) ÷ 320] x 100 = -70%
Formula
Percentage change = [(96 - 320) / 320] x 100
Subtract the new number by the original number
96 - 320 = -224
-224 ÷ 320 = -0.7
-0.7 x 100 = -70%
Example