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You are hosting a graduation party and you need 32 gallons of lemonade. Which is the best buy?

A six 5-gallon jugs at $100 each + two 1-gallon jugs at $15 each
Explaination
Comparing all the combinations, the best buy is the "six 5-gallon jugs at $100 each + two 1-gallon jugs at $15 each", which costs: (6 x $100) + (2 x $15) = $630 (32 gallons) The costs of the other combinations are: $542 + $208 = $750 (35 gallons) $542 + $100 + (2 x $15) = $672 (32 gallons) (3 x $208) + (2 x $15) = $654 (32 gallons)
B three 10-gallon jugs at $208 each + two 1-gallon jugs at $15 each
C one 25-gallon jug at $542 + one 10-gallon jug at $208
D one 25-gallon jug at $542 + one 5-gallon jug at $100 + two 1-gallon jugs at $15 each