2.77% is the change from 506 to 520
Calculation steps:
[( 520 - 506 ) ÷ 506] x 100 = 2.77%
Formula
Percentage change = [(520 - 506) / 506] x 100
Subtract the new number by the original number
520 - 506 = 14
14 ÷ 506 = 0.02766798418972332
0.02766798418972332 x 100 = 2.77%