-81.93% is the change from 548 to 99
Calculation steps:
[( 99 - 548 ) ÷ 548] x 100 = -81.93%
Formula
Percentage change = [(99 - 548) / 548] x 100
Subtract the new number by the original number
99 - 548 = -449
-449 ÷ 548 = -0.8193430656934306
-0.8193430656934306 x 100 = -81.93%