Question

Assume that an imaginary supermarket sells items that are identified by a unique item number which is an integer in range 100 to 499 inclusive. The items are classified in four different categories based on their numbers, and each category defines a different sales tax rate. These four categories along with the range of item numbers included in them, and their specific sales tax rates has been summarized in the following table:   

Category Item Numbers Sales Tax Rate

A                100 - 199                0   

B                200 - 299                5%

C                 300 - 399                7%

D                 400 - 499            12%   

You are to write a program that reads the number and the price of an item from the keyboard and displays the applicable tax rate and the price after tax on the screen.

a) Identify the inputs and the outputs of this program along with their data types. [10 marks]

b) Use structured English, as explained in the class, to write an algorithm for this problem. [20 marks]

c) Write a Python program for your algorithm in a function named main1(). [20 marks]

Question 2 [50 marks]
Based on the information provided in Question 1, write an algorithm for a program that reads the information of the items sold to a customer from the keyboard and displays the invoice including the total before tax, total tax, and total plus tax on the screen. Format your output as shown in the following example:    Total Before Tax          Total Tax          Total Plus Tax         1000.00                   125.00             1125.00    

NOTES: 1. The shopped items’ information is entered by the user one at a time and includes the item number, the item price, and the quantity. 2. Format your output to be printed organized like a table. To do so, try to set up an appropriate minimum field width, change the alignment of your outputs, and consider two digits of precision for your amounts.   3. Validate your inputs when necessary and display an error message in case an error happens. 4. Write your code in a function named main2() and add it to the Python file you created for Question 1.

Answer 1

part1

"""
a) Identify the inputs and the outputs of this program along with their data types. [10 marks]

INPUTS
item number : int
item_price : float

OUTPUTS
tax: float
total price: float


b) Use structured English, as explained in the class, to write an algorithm for this problem. [20 marks]

get the item_num from user
get the item_price from user
find the tax rate from given category
used the if elif condition for finding the appropriate tax rate
once tax rate found calculate the tax by formula
(item_price * tax_rate)/100

add the tax to price for final price
out put the tax and total price
"""

def main1():
    item_num = int(input("Enter item number: "))
    item_price = float(input("Enter price: "))
    tax_rate = 0
    if 100 <= item_num <= 199:
        tax_rate = 0
    elif 200 <= item_num <= 299:
        tax_rate = 5
    elif 300 <= item_num <= 399:
        tax_rate = 7
    elif 400 <= item_num <= 499:
        tax_rate = 12
    tax = ((item_price * tax_rate) / 100.0)
    total_price = item_price + tax
    print("Applicable tax: {0}".format(tax))
    print("Item Price with tax: {0}".format(total_price))

part 2

def main2():
    while 1:
        item_num = input("Enter item number: ")
        if not item_num.isnumeric():
            print("invalid number format, enter numeric digit only! try again")
            continue
        item_num = int(item_num)
        if not 100 <= item_num <= 499:
            print("invalid number! valid only [100-499]")
            continue
        break
    while 1:
        try:
            item_price = float(input("Enter price: "))
            break
        except:
            print("invalid price! try again")
    while 1:
        quantity = input("Enter Quantity: ")
        if not quantity.isnumeric() or int(quantity) < 1:
            print("invalid quantity! try again.")
        else:
            break
    quantity = int(quantity)
    if 100 <= item_num <= 199:
        tax_rate = 0
    elif 200 <= item_num <= 299:
        tax_rate = 5
    elif 300 <= item_num <= 399:
        tax_rate = 7
    elif 400 <= item_num <= 499:
        tax_rate = 12
    item_price = item_price * quantity
    tax = ((item_price * tax_rate) / 100.0)
    total_price = item_price + tax
    print("{:20}{:15}{:15}".format("Total Before Tax", "Total Tax", "Total Plus Tax"))
    print("{:.2f}{:-20.2f}{:-15.2f}".format(item_price, tax, total_price))

# OUT

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