56.62% is the change from 521 to 816
Calculation steps:
[( 816 - 521 ) ÷ 521] x 100 = 56.62%
Formula
Percentage change = [(816 - 521) / 521] x 100
Subtract the new number by the original number
816 - 521 = 295
295 ÷ 521 = 0.5662188099808061
0.5662188099808061 x 100 = 56.62%