-40% is the change from 415 to 249
Calculation steps:
[( 249 - 415 ) ÷ 415] x 100 = -40%
Formula
Percentage change = [(249 - 415) / 415] x 100
Subtract the new number by the original number
249 - 415 = -166
-166 ÷ 415 = -0.4
-0.4 x 100 = -40%
Example