Jacob is building ladders. One of his clients needs 10 ladders with 50 rungs, and 20 ladders with 60 rungs. Jacob has to charge $2 for every rung. How much does the client have to pay for the ladders?
10 ladders with 50 rungs have a total of 10*50=
<gadget id="calculator">10*50</gadget>
<output>500</output>
500 rungs.
20 ladders with 60 rungs have a total of 20*60=
<gadget id="calculator">20*60</gadget>
<output>1_200</output>
1200 rungs.
In total there are 1200+500=
<gadget id="calculator">1200+500</gadget>
<output>1_700</output>
1700 rungs.
The client must pay 2*1700=$
<gadget id="calculator">2*1700</gadget>
<output>3_400</output>
3400.

<result>3_400</result>