Calculate the cost price and selling price for the given mark-up and selling price/cost price.

Here are the calculations to complete the table:

1.2.1 Calculate Cost Price
Given: Mark-up on Cost = $100\%$, Selling Price = R $16\,800$
The selling price is the cost price plus the mark-up. If the mark-up is $100\%$ on cost, then the mark-up amount is equal to the cost price.

$$\text{Selling Price} = \text{Cost Price} + (\text{Cost Price} \times \text{Mark-up percentage})$$ $$\text{R } 16\,800 = \text{Cost Price} + (\text{Cost Price} \times 100\%)$$ $$\text{R } 16\,800 = \text{Cost Price} + \text{Cost Price}$$ $$\text{R } 16\,800 = 2 \times \text{Cost Price}$$ $$\text{Cost Price} = \frac{\text{R } 16\,800}{2}$$ $$\text{Cost Price} = \text{R } 8\,400$$

Rounding to the nearest 10: R $8\,400$
The cost price is R 8 400.

1.2.2 Calculate Selling Price
Given: Cost Price = R 140, Mark-up on Cost = $40\%$

$$\text{Selling Price} = \text{Cost Price} \times (1 + \text{Mark-up percentage})$$ $$\text{Selling Price} = \text{R } 140 \times (1 + 0.40)$$ $$\text{Selling Price} = \text{R } 140 \times 1.40$$ $$\text{Selling Price} = \text{R } 196$$

Rounding to the nearest 10: R 200
The selling price is R 200.

1.2.3 Calculate Selling Price
Given: Cost Price = R $1\,000$, Mark-up on Cost = $70\%$

$$\text{Selling Price} = \text{Cost Price} \times (1 + \text{Mark-up percentage})$$ $$\text{Selling Price} = \text{R } 1\,000 \times (1 + 0.70)$$ $$\text{Selling Price} = \text{R } 1\,000 \times 1.70$$ $$\text{Selling Price} = \text{R } 1\,700$$

Rounding to the nearest 10: R $1\,700$
The selling price is R 1 700.

1.2.4 Calculate Cost Price
Given: Mark-up on Cost = $15\%$, Selling Price = R $5\,720$

$$\text{Cost Price} = \frac{\text{Selling Price}}{1 + \text{Mark-up percentage}}$$ $$\text{Cost Price} = \frac{\text{R } 5\,720}{1 + 0.15}$$ $$\text{Cost Price} = \frac{\text{R } 5\,720}{1.15}$$ $$\text{Cost Price} \approx \text{R } 4\,973.91$$

Rounding to the nearest 10: R $4\,970$
The cost price is R 4 970.

1.2.5 Calculate Mark-up on Cost
Given: Cost Price = R $5\,800$, Selling Price = R $9\,600$

$$\text{Mark-up percentage} = \frac{\text{Selling Price} - \text{Cost Price}}{\text{Cost Price}} \times 100\%$$ $$\text{Mark-up percentage} = \frac{\text{R } 9\,600 - \text{R } 5\,800}{\text{R } 5\,800} \times 100\%$$ $$\text{Mark-up percentage} = \frac{\text{R } 3\,800}{\text{R } 5\,800} \times 100\%$$ $$\text{Mark-up percentage} \approx 0.65517 \times 100\%$$ $$\text{Mark-up percentage} \approx 65.517\%$$

Rounding to the nearest 10 (percentage point): $70\%$
The mark-up on cost is 70%.