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COST-TO-COST METHOD, in construction contracts, is an estimate of completion in which the state of completion is the ratio of costs incurred as of a given date divided by the estimated total project cost. See also PERCENTAGE OF COMPLETION METHOD OF ACCOUNTING.

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HIGH-LOW METHOD of approximating cost behavior considers only two points of data, the highest and lowest, for activity within the relevant range. The method first focuses on cost changes, allowing an analyst to determine the presence of any variable cost. Next, fixed costs are determined by subtracting variable cost from the total cost at either of the two data points. The calculation is an algebraic procedure used to separate a semi-variable cost into the variable and fixed components. The method calls for using the extreme data points (highest and lowest x - y pairs) in the COST-VOLUME FORMULA y = a + bx; where a = fixed cost portion and b = the variable rate.

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