-36.36% is the change from 66 to 42
Calculation steps:
[( 42 - 66 ) ÷ 66] x 100 = -36.36%
Formula
Percentage change = [(42 - 66) / 66] x 100
Subtract the new number by the original number
42 - 66 = -24
-24 ÷ 66 = -0.36363636363636365
-0.36363636363636365 x 100 = -36.36%