Tom decides to lease a car.  He drives 50 miles on Monday, Wednesday, and Friday, and Sunday for the rest of the days he drives 100 miles.  He has to pay $.1 per mile he drives.  He also has to pay a weekly fee of $100.  How much does he have to pay in a year.
He does the long drive 7-4=
<gadget id="calculator">7-4</gadget>
<output>3</output>
3 days a week.
So he drives a total of 4*50+3*100=
<gadget id="calculator">4*50+3*100</gadget>
<output>500</output>
500 miles a week.
That means the car cost 500*.1=$
<gadget id="calculator">500*.1</gadget>
<output>50</output>
50 just for the mileage per week.
So he pays 100+50=$
<gadget id="calculator">100+50</gadget>
<output>150</output>
150 per week for the car.
That means the total cost of the car is 150*52=$
<gadget id="calculator">150*52</gadget>
<output>7_800</output>
7800 a year.

<result>7_800</result>