20. Give meaningful identifiers for the following variables and write a proper C11 declaration and initialization to a reasonable value. (1, 6, 7) a. A variable to store the letter grade, (A, B, C, D, or F). b. A variable to store the sales tax price of an item. c. A variable to store the number of juice bottles sold. d. A variable to store the billing amount of a doctor’s visit. e. A variable to store the grade point average (GPA).

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