54.13% is the change from 521 to 803
Calculation steps:
[( 803 - 521 ) ÷ 521] x 100 = 54.13%
Formula
Percentage change = [(803 - 521) / 521] x 100
Subtract the new number by the original number
803 - 521 = 282
282 ÷ 521 = 0.5412667946257198
0.5412667946257198 x 100 = 54.13%