98.21% is the change from 280 to 555
Calculation steps:
[( 555 - 280 ) ÷ 280] x 100 = 98.21%
Formula
Percentage change = [(555 - 280) / 280] x 100
Subtract the new number by the original number
555 - 280 = 275
275 ÷ 280 = 0.9821428571428571
0.9821428571428571 x 100 = 98.21%