Need help woth this practice

Echo Company issued a unit for $50. It combines 1 common share with 1 preferred share. At the time of issue the market price of the preferred shares traded at $30 per share and the common shares traded at $15. What is the cost base of the preferred and common shares? What is the cost base of the preferred and common shares from each unit? a) $33.33 for the preferred share and $16.67 for the common. b) $45 for the preferred share and $45 for the common. Oc) $45 for the preferred share and $13.50 for the common. d) $30 for the preferred share and $15 for the common