-49.51% is the change from 511 to 258
Calculation steps:
[( 258 - 511 ) ÷ 511] x 100 = -49.51%
Formula
Percentage change = [(258 - 511) / 511] x 100
Subtract the new number by the original number
258 - 511 = -253
-253 ÷ 511 = -0.49510763209393344
-0.49510763209393344 x 100 = -49.51%