Find the vertex of the graph of the equation 
. Round your answer to two decimal places.
Definitions:
Cost Model
An accounting method that values an asset based on the amount spent to acquire it minus any depreciation.
Dividend Income
Income earned from owning shares in a company, paid out from the company's earnings to shareholders.
Common Shares
Equity securities that represent ownership in a company, entitling shareholders to vote and typically to receive dividends.
Other Income
Revenue from non-core business activities, including interest, dividends, or any other non-operational income sources.
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