-15.88% is the change from 340 to 286
Calculation steps:
[( 286 - 340 ) ÷ 340] x 100 = -15.88%
Formula
Percentage change = [(286 - 340) / 340] x 100
Subtract the new number by the original number
286 - 340 = -54
-54 ÷ 340 = -0.1588235294117647
-0.1588235294117647 x 100 = -15.88%