The market demand for rental properties in Key West during the "High Season" is estimated as follows:

QH = 36.2 1.50 PH + 0.10 PO + 0.075 Income

where QH is the quantity of rental properties rented during the High Season; PH and PO are rental price per square foot in dollars for the high-season and off-season, respectively; and Income denotes average household income of renters (in thousands of dollars per year).

Last year PH = $30, PO = $8, and I = $800. In addition, the quantity of houses rented in the off-season (QO) was 45

Based on this information, calculate the cross-price elasticity between the high-season and the off season. (That is, how does demand for the high season respond to a change in price in the off season?)