14% is the change from 457 to 521
Calculation steps:
[( 521 - 457 ) ÷ 457] x 100 = 14%
Formula
Percentage change = [(521 - 457) / 457] x 100
Subtract the new number by the original number
521 - 457 = 64
64 ÷ 457 = 0.1400437636761488
0.1400437636761488 x 100 = 14%