-62.14% is the change from 840 to 318
Calculation steps:
[( 318 - 840 ) ÷ 840] x 100 = -62.14%
Formula
Percentage change = [(318 - 840) / 840] x 100
Subtract the new number by the original number
318 - 840 = -522
-522 ÷ 840 = -0.6214285714285714
-0.6214285714285714 x 100 = -62.14%