68.52% is the change from 521 to 878
Calculation steps:
[( 878 - 521 ) ÷ 521] x 100 = 68.52%
Formula
Percentage change = [(878 - 521) / 521] x 100
Subtract the new number by the original number
878 - 521 = 357
357 ÷ 521 = 0.6852207293666027
0.6852207293666027 x 100 = 68.52%