An assay is an investigative (analytic) procedure in laboratory medicine, pharmacology, environmental biology and molecular biology for qualitatively assessing or quantitatively measuring the presence or amount or the functional activity of a target entity (the analyte). Qualitative assay, i.e. assays which generally give just a pass or fail, or positive or negative or some such sort of only small number of qualitative gradation rather than an exact quantity.
The average fixed cost (AFC) curve will decline as additional units are produced, and continue to decline. The average total cost (ATC) curve initially will decline as fixed costs are spread over a larger number of units, but will go up as marginal costs increase due to the law of diminishing returns.
Then you plot a variable cost line from this point, which will, in effect, be the total costs line. This is because the fixed cost added to the variable cost gives the total cost. To calculate the variable cost, you multiply variable cost per unit x number of units.In this example, you can assume that the variable cost per unit is Â£2 and there are 2,000 units = Â£4,000. Graph showing the breakeven point of a business. Once you have done this you are ready to plot the total revenue line.hen you plot a variable cost line from this point, which will, in effect, be the total costs line. This is because the fixed cost added to the variable cost gives the total cost. To calculate the variable cost, you multiply variable cost per unit x number of units.