Question 9 You currently own 2 sandwich shops: one in Hayward that faces a demand curve given by phi = 14 - 0.5Q (and MRH = 14 - Q), and a second shop in Oakland that faces a demand curve given by PO = 10 - 0.5Q (and MR. = 10 - Q). If the marginal cost of producing a sandwich is constant at $4 at both stores, you should charge. $9 ; $7 for a sandwich in Hayward and. for a sandwich in Oakland. $4 ; $4 $9 ; $9 $10 ; $10 O $10 ; $6 A Moving to another question will save this response