-93.33% is the change from 90 to 6
Calculation steps:
[( 6 - 90 ) ÷ 90] x 100 = -93.33%
Formula
Percentage change = [(6 - 90) / 90] x 100
Subtract the new number by the original number
6 - 90 = -84
-84 ÷ 90 = -0.9333333333333333
-0.9333333333333333 x 100 = -93.33%