-76.56% is the change from 320 to 75
Calculation steps:
[( 75 - 320 ) ÷ 320] x 100 = -76.56%
Formula
Percentage change = [(75 - 320) / 320] x 100
Subtract the new number by the original number
75 - 320 = -245
-245 ÷ 320 = -0.765625
-0.765625 x 100 = -76.56%