I share a room with another person. I am planning to buy a TV which costs $300. My room-mate and I have identical tastes in TV viewing so that we always watch TV together. I am willing to pay upto $120 for the TV. If it is EFFICIENT for me and my room-mate to have a TV, my room-mate's value for the TV should be at least,

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a$120

b$300

c$180

d$150