323.14% is the change from 121 to 512
Calculation steps:
[( 512 - 121 ) ÷ 121] x 100 = 323.14%
Formula
Percentage change = [(512 - 121) / 121] x 100
Subtract the new number by the original number
512 - 121 = 391
391 ÷ 121 = 3.231404958677686
3.231404958677686 x 100 = 323.14%