-35.12% is the change from 840 to 545
Calculation steps:
[( 545 - 840 ) ÷ 840] x 100 = -35.12%
Formula
Percentage change = [(545 - 840) / 840] x 100
Subtract the new number by the original number
545 - 840 = -295
-295 ÷ 840 = -0.35119047619047616
-0.35119047619047616 x 100 = -35.12%