73.32% is the change from 521 to 903
Calculation steps:
[( 903 - 521 ) ÷ 521] x 100 = 73.32%
Formula
Percentage change = [(903 - 521) / 521] x 100
Subtract the new number by the original number
903 - 521 = 382
382 ÷ 521 = 0.7332053742802304
0.7332053742802304 x 100 = 73.32%