83.4% is the change from 512 to 939
Calculation steps:
[( 939 - 512 ) ÷ 512] x 100 = 83.4%
Formula
Percentage change = [(939 - 512) / 512] x 100
Subtract the new number by the original number
939 - 512 = 427
427 ÷ 512 = 0.833984375
0.833984375 x 100 = 83.4%