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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

In an orchard, 80% of the trees were apple trees and the rest were pear trees. Last summer, the apple weevil killed some of the apple trees but no pear trees. Now 50% of the trees are apple trees. What percentage of the apple trees were killed by the apple weevil?

(A) $30\%$ (B) $40\%$ (C) $50\%$ (D) $60\%$ (E) $75\%$

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