Ans: A
The cost of profit making car
The cost of profit making car
$\begin{array}{cl}
= & \$80~080 \div (1+30\%) \\
= & \$61~600
\end{array}$
The cost of loss making car
$\begin{array}{cl}
= & \$80~080\div (1-30\%) \\
= & \$114~400
\end{array}$
Therefore, the overall balance
$\begin{array}{cl}
= & 2\times\$80~080 -(\$61~600+\$114~400) \\
= & -\$15~840
\end{array}$
Therefore, Susan loses $\$15~840$ after the two transactions.
