To find out how many milligrams of the vitamin are in the drink, we can calculate 150% of the recommended daily allowance (RDA) for the vitamin.
The RDA is given as 30 mg. To calculate 150% of this value, we can use the following formula:
\[ \text{Amount of vitamin} = \left( \frac{150}{100} \right) \times \text{RDA} \]
Substituting the RDA value:
\[ \text{Amount of vitamin} = 1.5 \times 30 \text{ mg} \]
Calculating that gives:
\[ \text{Amount of vitamin} = 45 \text{ mg} \]
So, there are 45 mg of the vitamin in the drink.