278.6% is the change from 257 to 973
Calculation steps:
[( 973 - 257 ) ÷ 257] x 100 = 278.6%
Formula
Percentage change = [(973 - 257) / 257] x 100
Subtract the new number by the original number
973 - 257 = 716
716 ÷ 257 = 2.7859922178988326
2.7859922178988326 x 100 = 278.6%