High School

1. A labour law company charges their clients a fixed monthly fee of R1,200 (called a retainer), plus R400 per hour consultation fee as and when required.

1.1 Complete the table below:

[tex]\[
\begin{tabular}{|l|c|c|c|c|c|c|}
\hline
Number of hours & 0 & 1 & 2 & 3 & C & 9 \\
\hline
Total charge (R) & A & 1600 & 2000 & B & 3600 & 4800 \\
\hline
\end{tabular}
\][/tex]

1.2 Determine a formula to represent the relationship between the number of hours and the total charge.

1.3 Use your formula from Question 1.2 to determine:

1.3.1 The total charge if a client required their services for 20 hours in a month.

1.3.2 The number of hours the labour law company worked for if the total charge was R19,200 for the month.

1.4 Use the completed table from Question 1.1 to draw the graph of the total charges of the labour law company.

2. Cindy hires a seamstress to sew bibs for her. She pays the seamstress R100 per day, plus R25 for each bib she completes.

2.1 Construct a table to represent the seamstress' total pay if she completes 15 bibs in a day.

2.2 Determine a formula to represent the seamstress' total pay.

2.3 Use your table from Question 2.1 to draw the graph of the seamstress' total pay.

2.4 Use your graph from Question 2.3 to determine:

2.4.1 How much the seamstress would be paid if she sewed 8 bibs?

2.4.2 How many bibs did the seamstress sew if she was paid R450?

Answer :

Sure, let's solve the questions step-by-step:

### Question 1

1.1 Complete the table

The formula to calculate the total charge by the labour law company is as follows:
[tex]\[ \text{Total Charge} = \text{Retainer} + (\text{Hourly Fee} \times \text{Number of hours}) \][/tex]
where the Retainer is R1,200 and the Hourly Fee is R400.

Given:
- Number of hours = 0:
[tex]\(\text{Total Charge} = 1200 + (400 \times 0) = 1200\)[/tex]
Therefore, A = 1200.

- Number of hours = 3:
[tex]\(\text{Total Charge} = 1200 + (400 \times 3) = 2400\)[/tex]
Therefore, B = 2400.

- For a Total Charge of R3600,
[tex]\(3600 = 1200 + (400 \times \text{C})\)[/tex]
Solving for C, [tex]\(\text{C} = \frac{3600 - 1200}{400} = 6\)[/tex].

The completed table is:
[tex]\[
\begin{tabular}{|l|c|c|c|c|c|c|}
\hline
Number of hours & 0 & 1 & 2 & 3 & 6 & 9 \\
\hline
Total charge (R) & 1200 & 1600 & 2000 & 2400 & 3600 & 4800 \\
\hline
\end{tabular}
\][/tex]

1.2 Formula to represent the relationship

The formula is:
[tex]\[ \text{Total Charge} = 1200 + 400 \times \text{Number of hours} \][/tex]

1.3 Use the formula

1.3.1 Total charge if a client required their services for 20 hours:

[tex]\[ \text{Total Charge} = 1200 + 400 \times 20 = 9200 \][/tex]
So, the total charge is R9,200.

1.3.2 Number of hours if the total charge was R19,200:

[tex]\[ 19200 = 1200 + 400 \times \text{Number of hours} \][/tex]
Solving for the number of hours:
[tex]\[ \text{Number of hours} = \frac{19200 - 1200}{400} = 45 \][/tex]

1.4 Graph the completed table

Using the completed table, plot the number of hours on the x-axis and the total charge on the y-axis. Connect the points to form a straight line, showing the linear relationship between the number of hours and the total charge.

### Question 2

2.1 Construct a table for 15 bibs

The formula for the seamstress' total pay is:
[tex]\[ \text{Total Pay} = \text{Daily Fee} + (\text{Per Bib Fee} \times \text{Number of Bibs}) \][/tex]
where the Daily Fee is R100 and the Per Bib Fee is R25.

For 15 bibs:
[tex]\[ \text{Total Pay} = 100 + 25 \times 15 = 475 \][/tex]
The table entry would be:
Number of bibs = 15, Total Pay = R475.

2.2 Formula to represent the seamstress' total pay

The formula is:
[tex]\[ \text{Total Pay} = 100 + 25 \times \text{Number of Bibs} \][/tex]

2.3 Graph the table

Using the table (similar to 2.1) plot the number of bibs on the x-axis and the total pay on the y-axis. Connect the dots to form a graph, showing the linear relationship.

2.4 Use the graph

2.4.1 Pay for sewing 8 bibs:

[tex]\[ \text{Total Pay} = 100 + 25 \times 8 = 300 \][/tex]
The seamstress is paid R300.

2.4.2 Number of bibs if paid R450:

[tex]\[ 450 = 100 + 25 \times \text{Number of Bibs} \][/tex]
Solving for the number of bibs:
[tex]\[ \text{Number of Bibs} = \frac{450 - 100}{25} = 14 \][/tex]

This concludes the detailed step-by-step solution for the given questions.