conversations.from: human
conversations.value: I would love to understand how to solve this problem: 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?
  Can you explain?
conversations.from: assistant
conversations.value: 10 ladders with 50 rungs have a total of 10*50=500 rungs.
  20 ladders with 60 rungs have a total of 20*60=1200 rungs.
  In total there are 1200+500=1700 rungs.
  The client must pay 2*1700=$3400.