30.61% is the change from 392 to 512
Calculation steps:
[( 512 - 392 ) ÷ 392] x 100 = 30.61%
Formula
Percentage change = [(512 - 392) / 392] x 100
Subtract the new number by the original number
512 - 392 = 120
120 ÷ 392 = 0.30612244897959184
0.30612244897959184 x 100 = 30.61%