108.75% is the change from 320 to 668
Calculation steps:
[( 668 - 320 ) ÷ 320] x 100 = 108.75%
Formula
Percentage change = [(668 - 320) / 320] x 100
Subtract the new number by the original number
668 - 320 = 348
348 ÷ 320 = 1.0875
1.0875 x 100 = 108.75%