-87.2% is the change from 328 to 42
Calculation steps:
[( 42 - 328 ) ÷ 328] x 100 = -87.2%
Formula
Percentage change = [(42 - 328) / 328] x 100
Subtract the new number by the original number
42 - 328 = -286
-286 ÷ 328 = -0.8719512195121951
-0.8719512195121951 x 100 = -87.2%