67.18% is the change from 521 to 871
Calculation steps:
[( 871 - 521 ) ÷ 521] x 100 = 67.18%
Formula
Percentage change = [(871 - 521) / 521] x 100
Subtract the new number by the original number
871 - 521 = 350
350 ÷ 521 = 0.6717850287907869
0.6717850287907869 x 100 = 67.18%