Suppose that an airline reduced its prices for flights to a certain city from an average of $$200$ to an average of $$170.$ Before the price change, a car rental company based at that city's airport had rented out about $60$ cars per day. After the airfare reduction, the car rental company noticed an increase in quantity demand to about $72$ cars per day.

What is the cross$-$price elasticity of demand for car rentals?

$-1\mathrm{.}33$

$-0\mathrm{.}75$

$0\mathrm{.}4$

$2\mathrm{.}5$