A bar is offering greatly reduced prices on their draft beer during their happy hour. (See above image for menu prices)
If a group of friends decide that they want to drink a total of liters, how much would it cost them(minimum)?
Details and assumptions:
1) extra for each L drink you buy,
2) extra for each L drink you buy and,
3) extra for each L drink that you buy
For example, if you buy a L drink and pay him , he will give you instead of .
You can buy at most ten L drink.
You can buy drinks in natural numbers, i.e. you can't buy glasses of L drink.
You have just got bills with you.