78.21% is the change from 280 to 499
Calculation steps:
[( 499 - 280 ) ÷ 280] x 100 = 78.21%
Formula
Percentage change = [(499 - 280) / 280] x 100
Subtract the new number by the original number
499 - 280 = 219
219 ÷ 280 = 0.7821428571428571
0.7821428571428571 x 100 = 78.21%