3837.5% is the change from 8 to 315
Calculation steps:
[( 315 - 8 ) ÷ 8] x 100 = 3837.5%
Formula
Percentage change = [(315 - 8) / 8] x 100
Subtract the new number by the original number
315 - 8 = 307
307 ÷ 8 = 38.375
38.375 x 100 = 3837.5%
Example