331/3% is about 110% 10% of 12 is 1.2 (12x0.1=1.2) 100% of 12 is 12 using the two values, 110% of 12 is 13.2. since you are gaining 110%, you are getting 13.2 more ounces which gives you a final volume of 25.2 ounces. (12ounces + 13.2ounces=25.2ounces)
