Ping pong balls sell for $.10 each.  Johnny buys 10000 for a prank.  He gets a 30% discount for buying in such large bulk.  How much does he pay?
The ping pong balls cost 10000*.10=$
<gadget id="calculator">10000*.10</gadget>
<output>1_000</output>
1000.
So the discount is 1000*.30=$
<gadget id="calculator">1000*.30</gadget>
<output>300</output>
300.
So he pays 1000-300=$
<gadget id="calculator">1000-300</gadget>
<output>700</output>
700.

<result>700</result>