Tom takes medication to help him sleep.  He takes 2 pills every day before bed.  He needs to go to the doctor every 6 months to get a new prescription and a visit to the doctor costs $400.  The medication costs $5 per pill, but insurance covers 80% of that cost.  How much does he pay a year for everything?
He sees the doctor 12/6=<T>divide(12, 6)=2.0 times a year
So he pays 400*2=$<T>multiply(400, 2)=800 for doctor visits
The cost of the pill is 5*2=$<T>multiply(5, 2)=10 per night
But insurance covers 10*.8=$<T>multiply(10, 0.8)=8.0
So he pays 10-8=$<T>subtract(10, 8)=2 per night
So he pays 2*365=$<T>multiply(2, 365)=730 a year
SSo his total cost is 800+730=$<T>add(800, 730)=1530 a year
