2950% is the change from 10 to 305
Calculation steps:
[( 305 - 10 ) ÷ 10] x 100 = 2950%
Formula
Percentage change = [(305 - 10) / 10] x 100
Subtract the new number by the original number
305 - 10 = 295
295 ÷ 10 = 29.5
29.5 x 100 = 2950%
Example