68.95% is the change from 306 to 517
Calculation steps:
[( 517 - 306 ) ÷ 306] x 100 = 68.95%
Formula
Percentage change = [(517 - 306) / 306] x 100
Subtract the new number by the original number
517 - 306 = 211
211 ÷ 306 = 0.6895424836601307
0.6895424836601307 x 100 = 68.95%