3400% is the change from 10 to 350
Calculation steps:
[( 350 - 10 ) ÷ 10] x 100 = 3400%
Formula
Percentage change = [(350 - 10) / 10] x 100
Subtract the new number by the original number
350 - 10 = 340
340 ÷ 10 = 34
34 x 100 = 3400%
Example