69.51% is the change from 305 to 517
Calculation steps:
[( 517 - 305 ) ÷ 305] x 100 = 69.51%
Formula
Percentage change = [(517 - 305) / 305] x 100
Subtract the new number by the original number
517 - 305 = 212
212 ÷ 305 = 0.6950819672131148
0.6950819672131148 x 100 = 69.51%