50.86% is the change from 521 to 786
Calculation steps:
[( 786 - 521 ) ÷ 521] x 100 = 50.86%
Formula
Percentage change = [(786 - 521) / 521] x 100
Subtract the new number by the original number
786 - 521 = 265
265 ÷ 521 = 0.508637236084453
0.508637236084453 x 100 = 50.86%