Write a program that can accept two inputs - a food type and a price, and determines if the food is affordable or expensive. This program should use an if-statement to determine. If the cost of the food is over $20, then the program should say it is expensive, and otherwise it should say it is affordable (this is arbitrary - for the purposes of making this problem simple).

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A:

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.