1. There are 200 people at the beach, and $65 \%$ of these people are children. If $40 \%$ of the children are swimming, how many children are swimming?
1. Since there are 200 people at the beach and $65 \%$ of these people are children, then there are $\frac{65}{100} \times 200=65 \times 2=130$ children at the beach.
Since there are 130 children at the beach and $40 \%$ of them are swimming, then there are $\frac{40}{100} \times 130=0.4 \times 130=52$ children swimming.
ANSWER: 52