-74.05% is the change from 840 to 218
Calculation steps:
[( 218 - 840 ) ÷ 840] x 100 = -74.05%
Formula
Percentage change = [(218 - 840) / 840] x 100
Subtract the new number by the original number
218 - 840 = -622
-622 ÷ 840 = -0.7404761904761905
-0.7404761904761905 x 100 = -74.05%