54.89% is the change from 521 to 807
Calculation steps:
[( 807 - 521 ) ÷ 521] x 100 = 54.89%
Formula
Percentage change = [(807 - 521) / 521] x 100
Subtract the new number by the original number
807 - 521 = 286
286 ÷ 521 = 0.5489443378119002
0.5489443378119002 x 100 = 54.89%