3400% is the change from 9 to 315
Calculation steps:
[( 315 - 9 ) ÷ 9] x 100 = 3400%
Formula
Percentage change = [(315 - 9) / 9] x 100
Subtract the new number by the original number
315 - 9 = 306
306 ÷ 9 = 34
34 x 100 = 3400%
Example