In a park, a visitor is assigned a table by randomly selecting one card from a set of 54 equally likely assignment cards. Each card shows the picnic area (A, B, or C) and whether the assigned table has an umbrella, as shown below.
| Picnic area | Umbrella | No umbrella |
|---|---|---|
| A | 6 | 12 |
| B | 9 | 9 |
| C | 14 | 4 |
Given that the assigned table has an umbrella, what is the probability that it is in Area C?