-85.01% is the change from 647 to 97
Calculation steps:
[( 97 - 647 ) ÷ 647] x 100 = -85.01%
Formula
Percentage change = [(97 - 647) / 647] x 100
Subtract the new number by the original number
97 - 647 = -550
-550 ÷ 647 = -0.8500772797527048
-0.8500772797527048 x 100 = -85.01%