68.73% is the change from 307 to 518
Calculation steps:
[( 518 - 307 ) ÷ 307] x 100 = 68.73%
Formula
Percentage change = [(518 - 307) / 307] x 100
Subtract the new number by the original number
518 - 307 = 211
211 ÷ 307 = 0.6872964169381107
0.6872964169381107 x 100 = 68.73%