283.14% is the change from 255 to 977
Calculation steps:
[( 977 - 255 ) ÷ 255] x 100 = 283.14%
Formula
Percentage change = [(977 - 255) / 255] x 100
Subtract the new number by the original number
977 - 255 = 722
722 ÷ 255 = 2.831372549019608
2.831372549019608 x 100 = 283.14%