56.24% is the change from 521 to 814
Calculation steps:
[( 814 - 521 ) ÷ 521] x 100 = 56.24%
Formula
Percentage change = [(814 - 521) / 521] x 100
Subtract the new number by the original number
814 - 521 = 293
293 ÷ 521 = 0.5623800383877159
0.5623800383877159 x 100 = 56.24%