198.83% is the change from 257 to 768
Calculation steps:
[( 768 - 257 ) ÷ 257] x 100 = 198.83%
Formula
Percentage change = [(768 - 257) / 257] x 100
Subtract the new number by the original number
768 - 257 = 511
511 ÷ 257 = 1.9883268482490273
1.9883268482490273 x 100 = 198.83%