One of Teddy’s jobs at home is to pump gas for his family’s sedan and truck. When he fills up the sedan with $12$ gallons of gas, he notices that it costs him $$50.28$.  

1. How much does one gallon of gas cost? This is also called the unit rate. Explain how you found your answer.

   Hint (a):

   One way to solve this problem is to set up a proportion. Try using the proportion provided.

   Answer (a):

   $4.19 = n$

2. How much will it cost him to fill up the truck if it needs $25$ gallons of gas? Show your work.

   Hint (b):

   Multiply the price per gallon by the number of gallons.

3. When Teddy filled up the tank on his moped, it cost $$5.03$. How much gas did his moped need? Explain how you know.

   Hint (c):

   Use a proportion to show the known cost ($$5.03$) over the unknown number of gallons, use the unit rate, and follow the strategy shown in part (a) to solve.