-61.47% is the change from 109 to 42
Calculation steps:
[( 42 - 109 ) ÷ 109] x 100 = -61.47%
Formula
Percentage change = [(42 - 109) / 109] x 100
Subtract the new number by the original number
42 - 109 = -67
-67 ÷ 109 = -0.6146788990825688
-0.6146788990825688 x 100 = -61.47%