Tom buys a bedroom set for $3000.  He sells his old bedroom for $1000 and uses that to pay for part of the bedroom set.  He then has to pay 10% a month for the bedroom set.  How much does he have to pay per month?
He has to pay 3000-1000=$
<gadget id="calculator">3000-1000</gadget>
<output>2_000</output>
2000.
So he has to pay 2000*.1=$
<gadget id="calculator">2000*.1</gadget>
<output>200</output>
200 per month.

<result>200</result>