3100% is the change from 10 to 320
Calculation steps:
[( 320 - 10 ) ÷ 10] x 100 = 3100%
Formula
Percentage change = [(320 - 10) / 10] x 100
Subtract the new number by the original number
320 - 10 = 310
310 ÷ 10 = 31
31 x 100 = 3100%
Example