Olympiad problems

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2019 AMC 8, 8

Gilda has a bag of marbles. She gives $20 \%$ of them to her friend Pedro. The, Gilda gives $10 \%$ of what is left to her other friend, Ebony. Finally, Gilda gives $25 \%$ of what is left in the bag to her brother. What percentage of her original bag does she have left? $\textbf{(A) } 20 \qquad\textbf{(B) } 33\tfrac{1}{3} \qquad\textbf{(C) } 38 \qquad\textbf{(D) } 45 \qquad\textbf{(E) } 54$

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