-15.3% is the change from 647 to 548
Calculation steps:
[( 548 - 647 ) ÷ 647] x 100 = -15.3%
Formula
Percentage change = [(548 - 647) / 647] x 100
Subtract the new number by the original number
548 - 647 = -99
-99 ÷ 647 = -0.15301391035548687
-0.15301391035548687 x 100 = -15.3%