-97.89% is the change from 331 to 7
Calculation steps:
[( 7 - 331 ) ÷ 331] x 100 = -97.89%
Formula
Percentage change = [(7 - 331) / 331] x 100
Subtract the new number by the original number
7 - 331 = -324
-324 ÷ 331 = -0.9788519637462235
-0.9788519637462235 x 100 = -97.89%