Variable overhead costs are expenses that fluctuate in direct proportion to changes in production volume or activity levels. Items like energy, machine maintenance, and indirect materials are classified as variable overhead because their total cost increases as the level of manufacturing activity increases, supporting the operational requirements of the production process.

The contribution margin is defined as the difference between total revenue and total variable costs. By rearranging the formula (Contribution Margin = Revenue - Variable Costs), we find that Revenue = Contribution Margin + Variable Costs. Therefore, $13,000 + $7,000 equals $20,000. This represents the total inflow from sales before accounting for fixed costs.

In this scenario, we need to find the flexible budget amount. The formula for calculating flexible budget is: (Variance x Standard Quantity) + Static Budget Quantity. Given the sales budget variance ($58000) and static budget operating income ($15000), we find the standard quantity by dividing the variance by the static budget operating income (58000 / 15000 = 3.87). Now, applying the formula, the flexible budget amount is (58000 x 3.87) + 15000 = $73,095.35. However, for multiple-choice questions, we round the answer to the nearest whole number, so the correct answer is $73,000.

The breakeven point in terms of revenue is calculated by dividing total fixed costs by the contribution margin ratio (percentage). This calculation identifies the total sales volume required for a company to cover all its costs, resulting in zero net profit or loss. It is a vital tool for financial planning and risk assessment.

The variable overhead efficiency variance measures the difference between the actual quantity of the cost allocation base used and the budgeted quantity allowed for the actual output. By subtracting the budgeted quantity of 17,000 from the actual quantity of 56,000, we arrive at a variance of 39,000. This figure indicates the extent to which the actual usage of the allocation base deviated from the planned usage.

Fixed overhead costs are defined as expenses that do not change in total amount within a relevant range of activity, even if the volume of production or sales increases or decreases. Examples include rent, insurance, and salaries of administrative staff. Understanding this behavior is essential for break-even analysis and determining the cost structure of a business entity.

Manufacturing overhead applied refers to the amount of indirect costs assigned to products using a predetermined overhead rate. This is a fundamental concept in normal costing, allowing businesses to estimate the cost of goods produced before the actual total overhead costs for the period are known.

The margin of safety represents the difference between actual or budgeted sales and the breakeven point. It indicates how much sales can drop before the company incurs a loss. By subtracting the breakeven sales (12 units) from the budgeted sales (50 units), we get 38 units, which is the safety buffer.

Fixed overhead costs are expenses that remain constant regardless of the volume of production within a relevant range. Depreciation on equipment, management salaries, and lease payments are classic examples of fixed overheads because these costs do not change in total even if the number of units produced increases or decreases.

Target net income is the desired profit after accounting for income tax expenses. To calculate it, one takes the target operating income and subtracts the tax liability, which is determined by multiplying the operating income by the applicable tax rate. This provides a realistic view of the actual profit the business expects to retain.