How is Simpkin Corporation's apportionable income assigned to State B calculated?

The correct approach to calculate Simpkin Corporation's apportionable income assigned to State B is to use a weighted average of factors. This method generally takes into account multiple factors such as sales, property, and payroll, recognizing that each contributes to the total business activities in a state but not necessarily equally.

In most states, the apportionment of income is conducted through a formula which assigns different weights to these factors based on the nature of the business and regulatory requirements. A weighted average takes into account the significance of each factor; for instance, a company might have a higher volume of sales than property or payroll, which would warrant a greater impact on the apportionment calculation.

Using a weighted average ensures that the tax assignment reflects a more equitable distribution of income across states where a business operates, rather than isolating the income to one factor, which can distort the actual economic activity occurring in the state. This allows for a comprehensive assessment of how each aspect of the corporation's operations influences its overall income generation in State B.