John buys 10 bottles of scotch for a total cost of $600.  He also buys twice as many bottles of cognac that cost 50% more per bottle.  How much does he spend on everything?
The scotch cost $600/10=$
<gadget id="calculator">600/10</gadget>
<output>60</output>
60 each.
He bought 10*2=
<gadget id="calculator">10*2</gadget>
<output>20</output>
20 bottles of cognac.
Each bottle cost .5*60=$
<gadget id="calculator">.5*60</gadget>
<output>30</output>
30 more than the scotch.
So they cost $60+$30=$
<gadget id="calculator">60+30</gadget>
<output>90</output>
90.
That means he spent $90*20=$
<gadget id="calculator">90*20</gadget>
<output>1_800</output>
1800 on the cognac.
So he spent a total of $600+$1800=$
<gadget id="calculator">600+1800</gadget>
<output>2_400</output>
2400.

<result>2_400</result>