-81.72% is the change from 279 to 51
Calculation steps:
[( 51 - 279 ) ÷ 279] x 100 = -81.72%
Formula
Percentage change = [(51 - 279) / 279] x 100
Subtract the new number by the original number
51 - 279 = -228
-228 ÷ 279 = -0.8172043010752689
-0.8172043010752689 x 100 = -81.72%