280.16% is the change from 257 to 977
Calculation steps:
[( 977 - 257 ) ÷ 257] x 100 = 280.16%
Formula
Percentage change = [(977 - 257) / 257] x 100
Subtract the new number by the original number
977 - 257 = 720
720 ÷ 257 = 2.801556420233463
2.801556420233463 x 100 = 280.16%