-69.76% is the change from 840 to 254
Calculation steps:
[( 254 - 840 ) ÷ 840] x 100 = -69.76%
Formula
Percentage change = [(254 - 840) / 840] x 100
Subtract the new number by the original number
254 - 840 = -586
-586 ÷ 840 = -0.6976190476190476
-0.6976190476190476 x 100 = -69.76%