8400% is the change from 6 to 510
Calculation steps:
[( 510 - 6 ) ÷ 6] x 100 = 8400%
Formula
Percentage change = [(510 - 6) / 6] x 100
Subtract the new number by the original number
510 - 6 = 504
504 ÷ 6 = 84
84 x 100 = 8400%
Example