1.76% is the change from 512 to 521
Calculation steps:
[( 521 - 512 ) ÷ 512] x 100 = 1.76%
Formula
Percentage change = [(521 - 512) / 512] x 100
Subtract the new number by the original number
521 - 512 = 9
9 ÷ 512 = 0.017578125
0.017578125 x 100 = 1.76%