56.05% is the change from 521 to 813
Calculation steps:
[( 813 - 521 ) ÷ 521] x 100 = 56.05%
Formula
Percentage change = [(813 - 521) / 521] x 100
Subtract the new number by the original number
813 - 521 = 292
292 ÷ 521 = 0.5604606525911708
0.5604606525911708 x 100 = 56.05%