-40.85% is the change from 71 to 42
Calculation steps:
[( 42 - 71 ) ÷ 71] x 100 = -40.85%
Formula
Percentage change = [(42 - 71) / 71] x 100
Subtract the new number by the original number
42 - 71 = -29
-29 ÷ 71 = -0.4084507042253521
-0.4084507042253521 x 100 = -40.85%