-27.14% is the change from 840 to 612
Calculation steps:
[( 612 - 840 ) ÷ 840] x 100 = -27.14%
Formula
Percentage change = [(612 - 840) / 840] x 100
Subtract the new number by the original number
612 - 840 = -228
-228 ÷ 840 = -0.2714285714285714
-0.2714285714285714 x 100 = -27.14%