-49.4% is the change from 251 to 127
Calculation steps:
[( 127 - 251 ) ÷ 251] x 100 = -49.4%
Formula
Percentage change = [(127 - 251) / 251] x 100
Subtract the new number by the original number
127 - 251 = -124
-124 ÷ 251 = -0.4940239043824701
-0.4940239043824701 x 100 = -49.4%