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Review: Revenue from Sweaters
Explanation
Since the normal price per sweater is x dollars, the lower price is 0.85x. The total revenue is this price times the number of sweaters, so
it's 
.
This is the same as 
,
which is answer choice (A).
Note that we used a handy decimal-point trick: when you
have an awkward multiplication with a decimal, you can freely move it to the
other number, and sometimes it's easier. For example, if we have to take 80% of
3.75, we can reformat as 
and pass the 0.1 to the second term, giving 
.
Again, the correct answer is (A).
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