A 68 mm bottle of hair dye sells for $1.75, a larger bottle of the same exact hair dye that is 270mm sells for $7.35. Which bottle of hair dye is the better buy? 

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Unit cost of smaller one=1.75/68 dollars per mm=$0.0257/mm.

Unit cost of larger one=7.35/270=$0.0272/mm.

Therefore the smaller one is the better buy (cheaper).

by Top Rated User (827k points)

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