-27.86% is the change from 840 to 606
Calculation steps:
[( 606 - 840 ) ÷ 840] x 100 = -27.86%
Formula
Percentage change = [(606 - 840) / 840] x 100
Subtract the new number by the original number
606 - 840 = -234
-234 ÷ 840 = -0.2785714285714286
-0.2785714285714286 x 100 = -27.86%