64.5% is the change from 507 to 834
Calculation steps:
[( 834 - 507 ) ÷ 507] x 100 = 64.5%
Formula
Percentage change = [(834 - 507) / 507] x 100
Subtract the new number by the original number
834 - 507 = 327
327 ÷ 507 = 0.6449704142011834
0.6449704142011834 x 100 = 64.5%