Suppose that business travelers and vacationers have the following demand for airline tickets from New York to Boston:
$$
\begin{array}{ccc}
\text { Price } & \begin{array}{c}
\text { Quantity Demanded } \\
\text { (business travelers) }
\end{array} & \begin{array}{c}
\text { Quantity Demanded } \\
\text { (vacationers) }
\end{array} \\
\hline \$ 150 & 2,100 \text { tickets } & 1,000 \text { tickets } \\
200 & 2,000 & 800 \\
250 & 1,900 & 600 \\
300 & 1,800 & 400
\end{array}
$$
a. As the price of tickets rises from $\$ 200$ to $\$ 250,$ what is the price elasticity of demand for (i) business travelers and (ii) vacationers? (Use the midpoint method in your calculations.)
b. Why might vacationers have a different elasticity from business travelers?