Thirty employed single individuals were randomly selected to examine the relationship between their age (Age)and their credit card debt (Debt)expressed as a percentage of their annual income.Three polynomial models were applied and the following table summarizes Excel's regression results. 
Using the quadratic regression equation,find the predicted maximum percentage debt.
Definitions:
Selling Price
The amount for which a product is sold, determined by considering costs, market demand, competition, and other factors.
Relevant Range
The range of activity within which assumptions about variable and fixed cost behaviors are valid for management decisions.
Contribution Margin
The portion of sales revenue that exceeds variable costs, serving to cover fixed expenses and contribute to profits.
Fixed Manufacturing Cost
Involves the expenses that do not fluctuate with the level of production, such as rent for factory premises, salaries of permanent employees, and depreciation of factory equipment.
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