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Algebra Difficulty 1.0 Junior Find the answer Canada

Anna's term mark was 80%. Her exam mark was 90%. In calculating her final mark, the term mark was given a weight of 70% and the exam mark a weight of 30%. What was her final mark?

(A) $81\%$ (B) $83\%$ (C) $84\%$ (D) $85\%$ (E) $87\%$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.