What is this solution

(10 pts) A buyer and a seller have valuations v and c for a car that the seller initially owns. The seller knows c. The buyer does not know 0, but believes it is drawn from a uniform distribution on [0, 1]. The buyer's value is a function of c, v(c) = kc, where k > 0. For each value of 1:, nd the subgame perfect equilibrium of the ultimatum game in which the buyer makes a price offer to the seller