Answer:
Main points you should right:
The importance of a cardinal
What a cardinal does
How does a cardinal help
What do they symbolize
How do cardinals bring good luck.
Do some research or from a text you read about cardinals.
Do a ratio dude:
12.2 19.5
------- = ------
200 x
Solve, and you get that x is approx equal to 320 mg.