-93.45% is the change from 840 to 55
Calculation steps:
[( 55 - 840 ) ÷ 840] x 100 = -93.45%
Formula
Percentage change = [(55 - 840) / 840] x 100
Subtract the new number by the original number
55 - 840 = -785
-785 ÷ 840 = -0.9345238095238095
-0.9345238095238095 x 100 = -93.45%