An online computer shop sells customised personal computers. Every computer sold includes a basic set of components costing 200 and additional items can be added from the table: Category | Item code | Description | Price () --- | --- | --- | --- Case | A1 | Compact | 75.00 Case | A2 | Tower | 150.00 RAM | B1 | 8 GB | 79.99 RAM | B2 | 16 GB | 149.99 RAM | B3 | 32 GB | 299.99 Main Hard Disk Drive | C1 | 1 TB HDD | 49.99 Main Hard Disk Drive | C2 | 2TB HDD | 89.99 Main Hard Disk Drive | C3 | 4TB HDD | 129.99 Solid State Drive | D1 | 240 GB SSD | 59.99 Solid State Drive | D2 | 480 GB SSD | 119.99 Second Hard Disk Drive | E1 | 1 TB HDD | 49.99 Second Hard Disk Drive | E2 | 2TB HDD | 89.99 Second Hard Disk Drive | E3 | 4TB HDD | 129.99 Optical Drive | F1 | DVD/Blu-Ray Player | 50.00 Optical Drive | F2 | DVD/Blu-Ray Re-writer | 100.00 Operating System | G1 | Standard Version | 100.00 Operating System | G2 | Professional Version | 175.00 As well as the basic set of components every computer must include one case, one RAM and one Main Hard Disk Drive from the table. A computer is supplied with or without an Operating System. Write and test a program or programs for the online computer shop. • Your program or programs must include appropriate prompts for the entry of data; data must be validated on entry. • Error messages and other output need to be set out clearly and understandably. • All arrays, variables, constants and other identifiers must have meaningful names. You will need to complete these three tasks. Each task must be fully tested. Task 1 – Setting up the system and ordering the main items. Write a program to: • use arrays to store the item code, description and price • allow a customer to choose one case, one RAM and one Main Hard Disk Drive • calculate the price of the computer using the cost of the chosen items and the basic set of components • store and output the chosen items and the price of the computer. Task 2 – Ordering additional items. Extend TASK 1 to: • allow a customer to choose whether to purchase any items from the other categories – if so, which item(s) • update the price of the computer • store and output the additional items and the new price of the computer. Task 3 – Offering discounts. Extend TASK 2 to: • apply a 5% discount to the price of the computer if the customer has bought only one additional item • apply a 10% discount to the price of the computer if the customer has bought two or more additional items • output the amount of money saved and the new price of the computer after the discount. All variables, constants and other identifiers must have meaningful names.

1. (a)(i)Identify one array you could have used for Task 1 and state its purpose.[2]
2. (a)(ii)Identify one variable you could have used for Task 2 and state its purpose.[2]
3. (a)(iii)Identify one constant you could have used for Task 3 and state its purpose.[2]
4. (b)Explain the benefits of storing Price as a real data type.[2]
5. (c)Write an algorithm to show how you completed Task 1, using either pseudocode, programming statements or a flowchart. It is not necessary to show initialisation or setting up of arrays in your answer.[6]
6. (d)Explain how your program completes Task 3. Any programming statements used in your answer must be fully explained.[4]
7. (e)Describe how you could alter your program to allow more than one computer to be bought.[2]