4.3% is the change from 488 to 509
Calculation steps:
[( 509 - 488 ) ÷ 488] x 100 = 4.3%
Formula
Percentage change = [(509 - 488) / 488] x 100
Subtract the new number by the original number
509 - 488 = 21
21 ÷ 488 = 0.0430327868852459
0.0430327868852459 x 100 = 4.3%