6437.5% is the change from 8 to 523
Calculation steps:
[( 523 - 8 ) ÷ 8] x 100 = 6437.5%
Formula
Percentage change = [(523 - 8) / 8] x 100
Subtract the new number by the original number
523 - 8 = 515
515 ÷ 8 = 64.375
64.375 x 100 = 6437.5%
Example