280.54% is the change from 257 to 978
Calculation steps:
[( 978 - 257 ) ÷ 257] x 100 = 280.54%
Formula
Percentage change = [(978 - 257) / 257] x 100
Subtract the new number by the original number
978 - 257 = 721
721 ÷ 257 = 2.8054474708171204
2.8054474708171204 x 100 = 280.54%