-49.29% is the change from 840 to 426
Calculation steps:
[( 426 - 840 ) ÷ 840] x 100 = -49.29%
Formula
Percentage change = [(426 - 840) / 840] x 100
Subtract the new number by the original number
426 - 840 = -414
-414 ÷ 840 = -0.4928571428571429
-0.4928571428571429 x 100 = -49.29%