-15.12% is the change from 648 to 550
Calculation steps:
[( 550 - 648 ) ÷ 648] x 100 = -15.12%
Formula
Percentage change = [(550 - 648) / 648] x 100
Subtract the new number by the original number
550 - 648 = -98
-98 ÷ 648 = -0.15123456790123457
-0.15123456790123457 x 100 = -15.12%