-57.58% is the change from 99 to 42
Calculation steps:
[( 42 - 99 ) ÷ 99] x 100 = -57.58%
Formula
Percentage change = [(42 - 99) / 99] x 100
Subtract the new number by the original number
42 - 99 = -57
-57 ÷ 99 = -0.5757575757575758
-0.5757575757575758 x 100 = -57.58%