[Tutor] I need help with my project

[Sibylle Koczian]

Am 28.11.2018 um 01:30 schrieb Treyton Hendrix:
> If the user selected a sandwich, french fries, and a beverage, reduce the
> total cost of the order by $1.00.
> 
> This is what I have to do and I don't know where to start.

Well, you are lucky. I just had my first mind-reading lesson today, you 
are my first victim and I'll tell you what you didn't say about your 
problem:

You know prices for sandwiches (one sort or more, with different 
prices?), french fries and beverages. If the user selects one or two of 
them, he pays the sum of the prices. If he selects one of each, he pays 
the sum minus $1.00.

How would you do this by hand?

If my mind-reading isn't yet perfect, please fill the gaps.