-51.6% is the change from 250 to 121
Calculation steps:
[( 121 - 250 ) ÷ 250] x 100 = -51.6%
Formula
Percentage change = [(121 - 250) / 250] x 100
Subtract the new number by the original number
121 - 250 = -129
-129 ÷ 250 = -0.516
-0.516 x 100 = -51.6%