68.4% is the change from 307 to 517
Calculation steps:
[( 517 - 307 ) ÷ 307] x 100 = 68.4%
Formula
Percentage change = [(517 - 307) / 307] x 100
Subtract the new number by the original number
517 - 307 = 210
210 ÷ 307 = 0.6840390879478827
0.6840390879478827 x 100 = 68.4%