-15.28% is the change from 648 to 549
Calculation steps:
[( 549 - 648 ) ÷ 648] x 100 = -15.28%
Formula
Percentage change = [(549 - 648) / 648] x 100
Subtract the new number by the original number
549 - 648 = -99
-99 ÷ 648 = -0.1527777777777778
-0.1527777777777778 x 100 = -15.28%