-85.63% is the change from 647 to 93
Calculation steps:
[( 93 - 647 ) ÷ 647] x 100 = -85.63%
Formula
Percentage change = [(93 - 647) / 647] x 100
Subtract the new number by the original number
93 - 647 = -554
-554 ÷ 647 = -0.8562596599690881
-0.8562596599690881 x 100 = -85.63%