3081.25% is the change from 16 to 509
Calculation steps:
[( 509 - 16 ) ÷ 16] x 100 = 3081.25%
Formula
Percentage change = [(509 - 16) / 16] x 100
Subtract the new number by the original number
509 - 16 = 493
493 ÷ 16 = 30.8125
30.8125 x 100 = 3081.25%