The reaction below occurs by a general-acid catalyzed mechanism. Use curved arrows to illustrate the ring-forming step of the mechanism. 
Definitions:
Net Income
The company's earnings post all deductions for expenses and taxes from its income.
Net Sales
The total revenue from sales after subtracting returns, allowances for damaged or missing goods, and discounts.
Return On Common Stockholders' Equity
A financial ratio that measures the amount of net income returned as a percentage of shareholders' equity, indicating the profitability of a company from the common shareholders' perspective.
Net Income
The remaining earnings of a corporation after deducting all costs, taxes, and expenses from its gross revenue.
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