83.5% is the change from 509 to 934
Calculation steps:
[( 934 - 509 ) ÷ 509] x 100 = 83.5%
Formula
Percentage change = [(934 - 509) / 509] x 100
Subtract the new number by the original number
934 - 509 = 425
425 ÷ 509 = 0.8349705304518664
0.8349705304518664 x 100 = 83.5%