A shampoo comes in two sizes—
a 12 fl. Oz. Bottle that sells for $3.32 and
a 16 fl. Oz. Bottle for $3.80.
Calculate the unit price (price per fl. oz.).
Which one is the least expensive?

Question

A shampoo comes in two sizes—> 
a 12 fl. Oz. Bottle that sells for $3.32 and 
a 16 fl. Oz. Bottle for $3.80. 
Calculate the unit price (price per fl. oz.).
Which one is the least expensive?

anonymous · Answer

So what's the price per fl. oz. for the first bottle?

anonymous · Answer

How do you calculate unit price?  You take the price and divide it by the number of units.  Hence the price per unit for bottle a is
$3.32/(12 fl. oz.) = $0.277 / fl. oz.

Make sense?  If so, you now calculate the unit price for bottle b.

anonymous · Answer

still there?

anonymous · Answer

i still dont get it

anonymous · Answer

Ok.  Suppose you buy 2 lbs of potatoes and they cost $5.  What's the price per pound?

anonymous · Answer

How much does 1 lb of potatoes cost if 2 lb cost $5?

anonymous · Answer

ok thanks u got it

anonymous · Answer

So what's the unit cost for the second bottle?