-40.85% is the change from 710 to 420
Calculation steps:
[( 420 - 710 ) ÷ 710] x 100 = -40.85%
Formula
Percentage change = [(420 - 710) / 710] x 100
Subtract the new number by the original number
420 - 710 = -290
-290 ÷ 710 = -0.4084507042253521
-0.4084507042253521 x 100 = -40.85%