John has to hire a lawyer.  He pays $1000 upfront.  He then gets charged $100 per hour.  The lawyer has to work 50 hours in court time.  It takes 2 times that long in prep time.  His brother pays half the fee.  How much did John pay?
The lawyer worked 50*2=<T>multiply(50, 2)=100 hours out of court
So he worked 100+50=<T>add(100, 50)=150 hours total
That means the hourly time cost 150*100=$<T>multiply(150, 100)=15000
Adding the upfront cost it was 15000+1000=$<T>add(15000, 1000)=16000
His brother paid half so he paid 16000/2=$<T>divide(16000, 2)=8000.0
