Tom opens an amusement park.  It cost $100,000 to open initially.  It also cost 1% of that to run per day.  He sells 150  tickets a day for $10 each.  How long will it take to make back his money?
It cost 100,000*.01=$<T>multiply(100000, 0.01)=1000.0 a day to keep the place open
He makes 150*10=$<T>multiply(150, 10)=1500 a day from the park
So he makes a profit of 1500-1000=$<T>subtract(1500, 1000)=500 a day
So it takes 100000/500=<T>divide(100000, 500)=200.0 days to make back his money
