115.69% is the change from 306 to 660
Calculation steps:
[( 660 - 306 ) ÷ 306] x 100 = 115.69%
Formula
Percentage change = [(660 - 306) / 306] x 100
Subtract the new number by the original number
660 - 306 = 354
354 ÷ 306 = 1.1568627450980393
1.1568627450980393 x 100 = 115.69%