The answer is $12.5 for 10 bottles
10book=30mins
divide 10
1book=3mins
time=(time to read 1 book) times (number of books)
time to read 1 book=3 mins
15 books
15 books=15 times 3mins
15books=45mins
45 mins
Well if you pick D and H then you have a 15% chance of winning out of 20 times which is 3 times
