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