258.37% is the change from 257 to 921
Calculation steps:
[( 921 - 257 ) ÷ 257] x 100 = 258.37%
Formula
Percentage change = [(921 - 257) / 257] x 100
Subtract the new number by the original number
921 - 257 = 664
664 ÷ 257 = 2.5836575875486383
2.5836575875486383 x 100 = 258.37%