-17.31% is the change from 260 to 215
Calculation steps:
[( 215 - 260 ) ÷ 260] x 100 = -17.31%
Formula
Percentage change = [(215 - 260) / 260] x 100
Subtract the new number by the original number
215 - 260 = -45
-45 ÷ 260 = -0.17307692307692307
-0.17307692307692307 x 100 = -17.31%