-22.94% is the change from 279 to 215
Calculation steps:
[( 215 - 279 ) ÷ 279] x 100 = -22.94%
Formula
Percentage change = [(215 - 279) / 279] x 100
Subtract the new number by the original number
215 - 279 = -64
-64 ÷ 279 = -0.22939068100358423
-0.22939068100358423 x 100 = -22.94%