Mark decides to buy packs of old magic cards and open them to sell.  He buys 3 packs for $1800 each.  He gets 1 card that is worth $4000 and another card worth $1000.  There are 30 more cards worth an average of $50 each.  How much money profit did he make?
The cheaper cards are worth a total of 30*50=$
<gadget id="calculator">30*50</gadget>
<output>1_500</output>
1500.
So all the cards together are worth 1500+4000+1000=$
<gadget id="calculator">1500+4000+1000</gadget>
<output>6_500</output>
6500.
The cost for the cards was 1800*3=$
<gadget id="calculator">1800*3</gadget>
<output>5_400</output>
5400.
So he made a profit of 6500-5400=$
<gadget id="calculator">6500-5400</gadget>
<output>1_100</output>
1100.

<result>1_100</result>