From the description of the graph, we have the following information regarding line A, which represents the cost of markers:
- The line A passes through the points \( (0, 0) \) and \( (3, 6) \). This indicates that 3 markers cost $6.
To find the cost per marker, we can calculate it as follows:
\[ \text{Cost per marker} = \frac{\text{Total cost}}{\text{Number of markers}} = \frac{6}{3} = 2 \text{ dollars per marker} \]
Now, to find the total cost for buying 10 markers, we multiply the cost per marker by the number of markers:
\[ \text{Total cost for 10 markers} = 10 \times 2 = 20 \text{ dollars} \]
Based on this calculation, the total cost for buying 10 of the type A markers would be:
$20.00