79.88% is the change from 512 to 921
Calculation steps:
[( 921 - 512 ) ÷ 512] x 100 = 79.88%
Formula
Percentage change = [(921 - 512) / 512] x 100
Subtract the new number by the original number
921 - 512 = 409
409 ÷ 512 = 0.798828125
0.798828125 x 100 = 79.88%