-98.21% is the change from 390 to 7
Calculation steps:
[( 7 - 390 ) ÷ 390] x 100 = -98.21%
Formula
Percentage change = [(7 - 390) / 390] x 100
Subtract the new number by the original number
7 - 390 = -383
-383 ÷ 390 = -0.982051282051282
-0.982051282051282 x 100 = -98.21%