-31.85% is the change from 942 to 642
Calculation steps:
[( 642 - 942 ) ÷ 942] x 100 = -31.85%
Formula
Percentage change = [(642 - 942) / 942] x 100
Subtract the new number by the original number
642 - 942 = -300
-300 ÷ 942 = -0.3184713375796178
-0.3184713375796178 x 100 = -31.85%