78.93% is the change from 280 to 501
Calculation steps:
[( 501 - 280 ) ÷ 280] x 100 = 78.93%
Formula
Percentage change = [(501 - 280) / 280] x 100
Subtract the new number by the original number
501 - 280 = 221
221 ÷ 280 = 0.7892857142857143
0.7892857142857143 x 100 = 78.93%