-98.7% is the change from 308 to 4
Calculation steps:
[( 4 - 308 ) ÷ 308] x 100 = -98.7%
Formula
Percentage change = [(4 - 308) / 308] x 100
Subtract the new number by the original number
4 - 308 = -304
-304 ÷ 308 = -0.987012987012987
-0.987012987012987 x 100 = -98.7%