97.5% is the change from 280 to 553
Calculation steps:
[( 553 - 280 ) ÷ 280] x 100 = 97.5%
Formula
Percentage change = [(553 - 280) / 280] x 100
Subtract the new number by the original number
553 - 280 = 273
273 ÷ 280 = 0.975
0.975 x 100 = 97.5%
Example