7.78% is the change from 501 to 540
Calculation steps:
[( 540 - 501 ) ÷ 501] x 100 = 7.78%
Formula
Percentage change = [(540 - 501) / 501] x 100
Subtract the new number by the original number
540 - 501 = 39
39 ÷ 501 = 0.07784431137724551
0.07784431137724551 x 100 = 7.78%