-69.05% is the change from 840 to 260
Calculation steps:
[( 260 - 840 ) ÷ 840] x 100 = -69.05%
Formula
Percentage change = [(260 - 840) / 840] x 100
Subtract the new number by the original number
260 - 840 = -580
-580 ÷ 840 = -0.6904761904761905
-0.6904761904761905 x 100 = -69.05%