Dianne runs a store that sells books.  37% of her 1000 customers end up returning their books.  Her books all cost 15 dollars apiece.  How much money does she keep in sales after subtracting the returns?
Diane made 1000*15= $
<gadget id="calculator">1000*15</gadget>
<output>15_000</output>
15000 in sales because she had 1000 customers each buy a $15 book.
37% of those customers returned their books, so that means she had .37*1000= 
<gadget id="calculator">37*.01*1000</gadget>
<output>370</output>
370 returns.
Each of those returns was for a $15 book, so she had 370*15= $
<gadget id="calculator">370*15</gadget>
<output>5_550</output>
5,550 in returns.
For her total leftover income, we subtract the returns from the sales and end up with 15000-5550= $
<gadget id="calculator">15000-5550</gadget>
<output>9_450</output>
9450 in income.

<result>9_450</result>