Mike decides to develop a plot of land.  He bought 200 acres for $70 per acre.  After development, he sold half of the acreage for $200 per acre.  How much profit did he make?
He bought the land for 200*70=$<T>multiply(200, 70)=14000
He sold 200/2=<T>divide(200, 2)=100.0 acres
He got 100*200=$<T>multiply(100, 200)=20000 from selling this
So he made a profit of 20,000-14,000=$<T>subtract(20000, 14000)=6000
