151.75% is the change from 257 to 647
Calculation steps:
[( 647 - 257 ) ÷ 257] x 100 = 151.75%
Formula
Percentage change = [(647 - 257) / 257] x 100
Subtract the new number by the original number
647 - 257 = 390
390 ÷ 257 = 1.517509727626459
1.517509727626459 x 100 = 151.75%