James sells a $500,000 house for 20% over market value.  He splits the revenue with his 3 brothers.  How much does each person get after taxes take away 10%?
He sells the house for 1+.2=<T>add(1, 0.2)=1.2 times its value
So he sells the house for 500,000*1.2=<T>multiply(500000, 1.2)=600000.0
He splits the money 1+3=<T>add(1, 3)=4 ways
So each person gets 600,000/4=$<T>divide(600000, 4)=150000.0 before taxes
Taxes take away 150,000*.1=$<T>multiply(150000, 0.1)=15000.0
So each person gets 150,000-15,000=$<T>subtract(150000, 15000)=135000
