Option Price Calculator Javascript Trip Calculator?

Javascript trip calculator? - option price calculator

Enter the code to calculate the application, the users on the expected return from a trip can be as follows:

The user can plan miles
The user can view the expected cost of gasoline per gallon
The application must:

Interface options offer to enable the user to the expected costs to be calculated and terminate the application
Calculates and displays the approximate cost, including oil changes
Please I need this project IC tries to do for 3 weeks and still someone can help me, Can U Maek It is not like the price change cantd Help Evry SCDIO included 6000 miles $ 50. Thanks