-54.76% is the change from 42 to 19
Calculation steps:
[( 19 - 42 ) ÷ 42] x 100 = -54.76%
Formula
Percentage change = [(19 - 42) / 42] x 100
Subtract the new number by the original number
19 - 42 = -23
-23 ÷ 42 = -0.5476190476190477
-0.5476190476190477 x 100 = -54.76%