Ans: (a) $\$153$ (b) $\$150$
- The selling price of the toy
$\begin{array}{cl}
= & 255 \times (1-40\%) \\
= & \$ 153
\end{array}$ - The cost of the toy
$\begin{array}{cl}
= & 153 \div (1 + 2\%) \\
= & \$150
\end{array}$
