You would keep the 2 hour for the whole number of the mixed number and then, make the minutes (15) as a fraction with 60, and divide them both by 20. that is just for the mixed number.
1 bottle contains 3 liter
12 bottles contains (12*3) = 36 liter
1 case contains 12 bottle
5 cases contains (12*5) = 60 bottle
3/8 is bigger than 3/10. In maths 10ths are smaller than 8ths. If both have three parts it means that 3/8 must be bigger
The answer is B. $0.25/1 oz.