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.
Contribution Margin Increase. The contribution margin ratio increases when sales increase. For every $1 increase in sales, profits increase by the contribution margin ratio. For example, if a companyâs contribution margin ratio is 25 percent, it is earning roughly 25 cents in profit for every one dollar in sales.If the contribution margin increases to 35 percent due to increased sales, the company earns 35 cents for every one dollar in sales.f a company has $100 in revenue from sales and $30 in variable expenses, then its contribution margin is $100 - $30 = $70. In this case, the contribution margin ratio is $70 / $100 = .70. Multiply .70 by 100 to change the decimal into a percentage and you get 70 percent.