50.29% is the change from 521 to 783
Calculation steps:
[( 783 - 521 ) ÷ 521] x 100 = 50.29%
Formula
Percentage change = [(783 - 521) / 521] x 100
Subtract the new number by the original number
783 - 521 = 262
262 ÷ 521 = 0.5028790786948176
0.5028790786948176 x 100 = 50.29%