3762.5% is the change from 8 to 309
Calculation steps:
[( 309 - 8 ) ÷ 8] x 100 = 3762.5%
Formula
Percentage change = [(309 - 8) / 8] x 100
Subtract the new number by the original number
309 - 8 = 301
301 ÷ 8 = 37.625
37.625 x 100 = 3762.5%
Example