Solve the differential equation. 
Definitions:
Cost of Goods Sold
Represents the direct costs attributable to the production of goods sold by a company, including materials and labor.
Return on Equity
A measure of a corporation’s profitability that reveals how much profit a company generates with the money shareholders have invested.
Price-Earnings Ratio
A metric assessing the relationship between a company's stock price and its earnings on a per-share basis, useful in judging whether a stock is undervalued or overvalued.
Profit Margin
A financial metric indicating the percentage of revenue that exceeds the cost of goods sold, representing the portion of sales that turns into profits.
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