16.55% is the change from 447 to 521
Calculation steps:
[( 521 - 447 ) ÷ 447] x 100 = 16.55%
Formula
Percentage change = [(521 - 447) / 447] x 100
Subtract the new number by the original number
521 - 447 = 74
74 ÷ 447 = 0.16554809843400448
0.16554809843400448 x 100 = 16.55%