What did I have to add to get my answers

For example, when the Cost was R8,50, you calculated:

$$\text{Number of ribbons} = \frac{\text{R}8.50}{\text{R}8.50} = \mathbf{1}$$

And when the Cost was R59,50, you calculated:

$$\text{Number of ribbons} = \frac{\text{R}59.50}{\text{R}8.50} = \mathbf{7}$$

For example, when the Number of ribbons was 20, you calculated:

$$\text{Cost} = 20 \times \text{R}8.50 = \mathbf{R}170$$

And when the Number of ribbons was 100, you calculated:

$$\text{Cost} = 100 \times \text{R}8.50 = \mathbf{R}850$$