224.51% is the change from 257 to 834
Calculation steps:
[( 834 - 257 ) ÷ 257] x 100 = 224.51%
Formula
Percentage change = [(834 - 257) / 257] x 100
Subtract the new number by the original number
834 - 257 = 577
577 ÷ 257 = 2.245136186770428
2.245136186770428 x 100 = 224.51%