Average and Median Earnings. As of 2011, electricians earned an average of $52,910 per year, according to the Bureau of Labor Statistics. The average hourly pay for an electrician was estimated to be $25.44.The median annual income of electricians in the United States was $49,320, and the median-earning 50 percent of electricians made between $37,570 and $65,260 a year.s of 2011, the highest-paid electricians were those who taught at business schools. These workers earned an average of $79,250 a year. Most electricians worked as building equipment contractors, earning an average annual income of $52,600.
The contribution margin, sometimes used as a ratio, is the difference between a company's total sales revenue and variable costs. In other words, the contribution margin equals the amount that sales exceed variable costs. This is the sales amount that can be used to, or contributed to, pay off fixed costs.
It deals with how operating profit is affected by changes in variable costs, fixed costs, selling price per unit and the sales mix of two or more different products. CVP analysis has following assumptions: 1  All cost can be categorized as variable or fixed.ontribution Margin (CM). Contribution Margin (CM) is equal to the difference between total sales (S) and total variable cost or, in other words, it is the amount by which sales exceed total variable costs (VC). In order to make profit the contribution margin of a business must exceed its total fixed costs. In short: