122.5% is the change from 280 to 623
Calculation steps:
[( 623 - 280 ) ÷ 280] x 100 = 122.5%
Formula
Percentage change = [(623 - 280) / 280] x 100
Subtract the new number by the original number
623 - 280 = 343
343 ÷ 280 = 1.225
1.225 x 100 = 122.5%
Example