-70.97% is the change from 279 to 81
Calculation steps:
[( 81 - 279 ) ÷ 279] x 100 = -70.97%
Formula
Percentage change = [(81 - 279) / 279] x 100
Subtract the new number by the original number
81 - 279 = -198
-198 ÷ 279 = -0.7096774193548387
-0.7096774193548387 x 100 = -70.97%