-97.87% is the change from 328 to 7
Calculation steps:
[( 7 - 328 ) ÷ 328] x 100 = -97.87%
Formula
Percentage change = [(7 - 328) / 328] x 100
Subtract the new number by the original number
7 - 328 = -321
-321 ÷ 328 = -0.9786585365853658
-0.9786585365853658 x 100 = -97.87%