7171.43% is the change from 7 to 509
Calculation steps:
[( 509 - 7 ) ÷ 7] x 100 = 7171.43%
Formula
Percentage change = [(509 - 7) / 7] x 100
Subtract the new number by the original number
509 - 7 = 502
502 ÷ 7 = 71.71428571428571
71.71428571428571 x 100 = 7171.43%