-64.39% is the change from 278 to 99
Calculation steps:
[( 99 - 278 ) ÷ 278] x 100 = -64.39%
Formula
Percentage change = [(99 - 278) / 278] x 100
Subtract the new number by the original number
99 - 278 = -179
-179 ÷ 278 = -0.6438848920863309
-0.6438848920863309 x 100 = -64.39%