32.91% is the change from 392 to 521
Calculation steps:
[( 521 - 392 ) ÷ 392] x 100 = 32.91%
Formula
Percentage change = [(521 - 392) / 392] x 100
Subtract the new number by the original number
521 - 392 = 129
129 ÷ 392 = 0.32908163265306123
0.32908163265306123 x 100 = 32.91%