Alice’s code has some new elements we haven’t seen before, so let’s experiment a bit to figure out how it works! Open the Alice’s Restaurant starter file , click “Run”, and try using the cost function in the Interactions window.
1 What does (cost "hamburger") evaluate to?
2 What does (cost "pie") evaluate to?
3 What if you ask for (cost "fries")?
4 Explain what the function is doing in your own words.
5 What is the function’s name? Domain? Range?
6 What is the name of its variable?
7 Alice says onion rings have gone up to $3.75. Change the cost function to reflect this.
8 Try adding menu items of your own. What’s your favorite?
9 For an unknown food item, the function produces the String "That’s not on the menu!" Is this a problem? Why or why not?
10 Suppose Alice wants to calculate the price of a hamburger, including a 5% sales tax. Draw a Circle of Evaluation for the expression below.
These materials were developed partly through support of the National Science Foundation,
(awards 1042210, 1535276, 1648684, and 1738598). 
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