-92.22% is the change from 90 to 7
Calculation steps:
[( 7 - 90 ) ÷ 90] x 100 = -92.22%
Formula
Percentage change = [(7 - 90) / 90] x 100
Subtract the new number by the original number
7 - 90 = -83
-83 ÷ 90 = -0.9222222222222223
-0.9222222222222223 x 100 = -92.22%