75.62% is the change from 521 to 915
Calculation steps:
[( 915 - 521 ) ÷ 521] x 100 = 75.62%
Formula
Percentage change = [(915 - 521) / 521] x 100
Subtract the new number by the original number
915 - 521 = 394
394 ÷ 521 = 0.7562380038387716
0.7562380038387716 x 100 = 75.62%