Finding the final cost of an item that originally sold for x dollars but is marked down 40% and has an 8.25% tax rate.
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y = x2
You really need some nested loops; but some programming languages might allow you to write this as one statement.
21/3 = 7
When defining your function, do not put any arguments in the definition (e.g. function myFuntion()). Inside the function, you can use func_num_args() and func_get_arg($number) to get the function's arguments.
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