Final answer:
When Metcalf Company issues additional shares at a price higher than its per share consolidated value, the ownership interest of Washburn Company in Metcalf Company decreases.
Step-by-step explanation:
When Metcalf Company issues additional shares to outside parties at a price higher than its per share consolidated value, it means that the new shares are being sold at a premium. In this case, the business combination between Washburn Company and Metcalf Company is affected because the ownership interest of Washburn Company in Metcalf Company decreases. The reason for this decrease is that the ownership percentage of Washburn Company remains the same (at 75%), but the total number of shares outstanding increases due to the issuance of additional shares to outside parties.