Read the passage and answer the questions below.

1600 satellites were sent up by a country for several purposes. The purposes are classified as broadcasting (B), communication (C), surveillance (S), and others (O). A satellite can serve multiple purposes; however a satellite serving either B , or C , or S does not serve O . The following facts are known about the satellites:

1. The numbers of satellites serving $B, C$, and $S$ (though may be not exclusively) are in the ratio $2: 1: 1$.

2. The number of satellites serving all three of $B$, $C$, and $S$ is 100 .

3. The number of satellites exclusively serving $C$ is the same as the number of satellites exclusively serving $S$. This number is $30 \%$ of the number of satellites exclusively serving $B$.

4. The number of satellites serving $O$ is the same as the number of satellites serving both $C$ and $S$ but not $B$.