-35.71% is the change from 42 to 27
Calculation steps:
[( 27 - 42 ) ÷ 42] x 100 = -35.71%
Formula
Percentage change = [(27 - 42) / 42] x 100
Subtract the new number by the original number
27 - 42 = -15
-15 ÷ 42 = -0.35714285714285715
-0.35714285714285715 x 100 = -35.71%