30.13% is the change from 521 to 678
Calculation steps:
[( 678 - 521 ) ÷ 521] x 100 = 30.13%
Formula
Percentage change = [(678 - 521) / 521] x 100
Subtract the new number by the original number
678 - 521 = 157
157 ÷ 521 = 0.30134357005758156
0.30134357005758156 x 100 = 30.13%