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) $87 \%$
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) $87 \%$

Solution

Anna's final mark is $80(0.7)+90(0.3)$

$$
\begin{aligned}
& =56+27 \\
& =83
\end{aligned}
$$

ANSWER: (B)