-88% is the change from 350 to 42
Calculation steps:
[( 42 - 350 ) ÷ 350] x 100 = -88%
Formula
Percentage change = [(42 - 350) / 350] x 100
Subtract the new number by the original number
42 - 350 = -308
-308 ÷ 350 = -0.88
-0.88 x 100 = -88%
Example