National income accounting is a. an accounting system used by businesses to calculate their profits during a given production period. b. used by international organizations such as the world bank to determine individual country assessments (fees). c. a system used by tax accountants to calculate the tax liabilities of transnational corporations. d. a system of accounts designed to measure aggregate economic activity in a country.

The answer is "a system of accounts designed to measure aggregate economic activity in a country".

National income accounting is an accounting framework that a government uses to gauge the level of the nation's financial movement in a given day and age. Accounting records of this nature incorporate information with respect to total incomes earned by domestic partnerships, salary paid to outside and local laborers, and the sum spent on sales and income taxes by enterprises and people living in the nation.

a manufacturer of printed circuit boards uses exponential smoothing with trend to forecast monthly demand of its product. at the end of december, the company wishes to forecast sales for january. the estimate of trend through november has been 200 additional boards sold per month. average sales have been around 1000 units per month. the demand for december was 1100 units. the company uses α = 0.20 and β = 0.10. make a forecast including trend for the month of january.