77.12% is the change from 520 to 921
Calculation steps:
[( 921 - 520 ) ÷ 520] x 100 = 77.12%
Formula
Percentage change = [(921 - 520) / 520] x 100
Subtract the new number by the original number
921 - 520 = 401
401 ÷ 520 = 0.7711538461538462
0.7711538461538462 x 100 = 77.12%