human
Jacob is building ladders. One of his clients needs 10 ladders with 50 rungs, and 20 ladders with 60 rungs. Jacob has to charge $2 for every rung. How much does the client have to pay for the ladders?
assistant
How many rungs are in the 10 ladders? ** 10 ladders with 50 rungs have a total of 10*50=<<10*50=500>>500 rungs.
How many rungs are in the 20 ladders? ** 20 ladders with 60 rungs have a total of 20*60=<<20*60=1200>>1200 rungs.
How many rungs are in the ladders? ** In total there are 1200+500=<<1200+500=1700>>1700 rungs.
How much does the client have to pay for the ladders? ** The client must pay 2*1700=$<<2*1700=3400>>3400.
#### 3,400