-15.35% is the change from 254 to 215
Calculation steps:
[( 215 - 254 ) ÷ 254] x 100 = -15.35%
Formula
Percentage change = [(215 - 254) / 254] x 100
Subtract the new number by the original number
215 - 254 = -39
-39 ÷ 254 = -0.15354330708661418
-0.15354330708661418 x 100 = -15.35%