73.51% is the change from 521 to 904
Calculation steps:
[( 904 - 521 ) ÷ 521] x 100 = 73.51%
Formula
Percentage change = [(904 - 521) / 521] x 100
Subtract the new number by the original number
904 - 521 = 383
383 ÷ 521 = 0.7351247600767754
0.7351247600767754 x 100 = 73.51%