-77.86% is the change from 840 to 186
Calculation steps:
[( 186 - 840 ) ÷ 840] x 100 = -77.86%
Formula
Percentage change = [(186 - 840) / 840] x 100
Subtract the new number by the original number
186 - 840 = -654
-654 ÷ 840 = -0.7785714285714286
-0.7785714285714286 x 100 = -77.86%