单选题
编号：2690378
1. A demand function for cellular telephones is given by:
= 390-4
+ 0. 015 income + 2. 2 
e-0. 55 
. At current average prices, a cellphone costs $100, a landline costs $60, and wireless service costs $40. Average income is $20,000. The price of cellular telephones as a function of quantity demanded (QD) is most accuratelydescribed as:
= 390-4 + 0. 015 income + 2. 2 e-0. 55 . At current average prices, a cellphone costs $100, a landline costs $60, and wireless service costs $40. Average income is $20,000. The price of cellular telephones as a function of quantity demanded (QD) is most accuratelydescribed as: