-25% is the change from 228 to 171
Calculation steps:
[( 171 - 228 ) ÷ 228] x 100 = -25%
Formula
Percentage change = [(171 - 228) / 228] x 100
Subtract the new number by the original number
171 - 228 = -57
-57 ÷ 228 = -0.25
-0.25 x 100 = -25%
Example