3.1 As availability of water is becoming a major problem in South Africa, more

people are intending to save water. Therefore some of them are

investigating how they are billed and if the billing is correctly calculated.

Mrs. Treace is one of those people and stays in Cape Town. She studied the

water tariffs for 2013–2014 carefully.

Below is a table showing the water tariffs for Cape Town during

2013–2014. Study the table carefully before answering the questions.

3.1.1 Calculate the missing values for A and B respectively. (4)

3.1.2 If Mrs. Treace uses on average 19,5 kl of water per month, will she

be paying for the full 19,5 kl? Give a reason for your answer. (2)

3.1.3 Hence, calculate how much Mrs. Treace will pay for using 19,5 kl of

water including VAT. (4)

Below are diagrams of a vertical, round water tank and a rectangular water

tank. Study these diagrams and the information given and then answer the

questions that follow.

3.2.1 Show with the necessary calculations that the volume of the vertical

round water tank numbered 1 is not exactly 1000 liters as indicated

in the table.

Use the formula:

Volume of vertical round water tank = 3,142 x radius2 x height of the water tank.

Please Note: 1 m3 = 1000 l (6)

3.2.2 With reference to your answer in QUESTION 3.2.1, why do you

think that there is a difference in the volume between what you have

calculated and the given volume? Also explain how this given

information can be misleading to consumers. (3)

3.2.3 Briefly explain why the diagrams indicate a recommended filled

height. (2)

3.2.4 In her backyard, Mrs. Treace has only one open area next to her

house to install the water tank. The width of the area is 1,15 m.

Which of the water tanks must she buy that will satisfy the

requirement? (2)

3.3 Mrs. Treace will be using the water in her water tank for various purposes. If

Mrs. Treace wants to illustrate her usage graphically, which graphical

representations can Mrs. Treace use to illustrate how she is using the

water? (2)**[25]**