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Question : Lucinda collects Kewpie dolls, and can afford to buy up

Lucinda collects Kewpie dolls, and can afford to buy up to six dolls. The table below describes the marginal benefit Lucinda gets for each additional doll she adds to her collection.

a. If the price of Kewpie dolls is $6.00 per doll, how many dolls would Lucinda buy if she is rational?

b. If the price of Kewpie dolls rose to $9.00 a doll, how many dolls would Lucinda buy if she is rational?