-49% is the change from 251 to 128
Calculation steps:
[( 128 - 251 ) ÷ 251] x 100 = -49%
Formula
Percentage change = [(128 - 251) / 251] x 100
Subtract the new number by the original number
128 - 251 = -123
-123 ÷ 251 = -0.4900398406374502
-0.4900398406374502 x 100 = -49%