Exercise 2 (Based on an exercise by Cay Horstmann and Rance Necaise) A supermarket awards coupons depending on how much a customer spends on groceries. For example, if you spend $50, you'1l get a coupon worth 8% of that amount ( $4). The following table shows the percentage used to calculate the coupon awarded for different amounts spent: Use the function design recipe (examples, header, description, body, test) to develop a function named coupon. The function has one parameter, which is the amount spent on groceries. Use a descriptive name. The function returns the value of the coupon. Your function definition must have type annotations and a complete docstring (a brief description of what the function does, any preconditions, and two or three examples showing how to use the shell to test the functions). Type the function definition below the comment, \# Exercise 2. Use the Python shell to test coupon