please solve this question and draw the tree decision

AAC Hospital, wants to make a 1-year contract for purchasing 75000 dases af COVD-19 vaccine. Purchasing manager of the haspital has received affers from three alternative campanies (GPE, FMS, and DM). The costs offered by these campanies are give below. For the current contracted amount of doses, the best alternative is FMS CPE DM If the contracted amount of doses changes to 275000 , the best allenative is GPE FMS DM If the contracted amount of dosos changes to 375000 the best aftenative is DU CPE FMS