Ans: C
The total expenditure of John that week
The total expenditure of John that week
$\begin{array}{cl}
= & \$ 240 \div \dfrac{160^\circ}{360^\circ} \\
= & \$ 540
\end{array}$
The angle at centre of the transportation sector
$\begin{array}{cl}
= & 360^\circ – 90^\circ – 50^\circ – 160^\circ \\
= & 60^\circ
\end{array}$
Hence, his expenditure on transportation that week
$\begin{array}{cl}
= & \$ 540 \times \dfrac{60^\circ}{360^\circ} \\
= & \$ 90
\end{array}$
