To find Sandra's monthly premium, we first need to calculate her six-month premium using the formula \( P = DB \).
Given:
- \( D = 1.0 \)
- \( B = 567 \)
Substituting the values into the formula:
\[ P = 1.0 \times 567 = 567 \]
This means her six-month premium is $567.
To find the monthly premium, we divide the six-month premium by 6:
\[ \text{Monthly Premium} = \frac{567}{6} = 94.50 \]
Therefore, Sandra's monthly premium is $94.50.