Estimate the sum of 
to within 0.01.
Definitions:
Sales Proportion
The ratio or percentage of a product's sales in relation to total sales of all products, indicating its market performance.
Cost-Volume-Profit Graph
A visual representation that shows how changes in cost and volume affect a company's profit.
Step-Wise Costs
Costs that remain fixed over a range of activity but will increase in a step-like manner when a certain threshold is reached.
Break-Even Points
The volume of production or sales at which total revenues equal total expenses, resulting in no net profit or loss, used for financial analysis and planning.
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