The total cost of reaching consumers (C) depends upon the nu…

The total cost of reaching consumers (C) depends upon the number of consumers (N), advertising costs (A), and transportation costs (T). The linear cost prediction model is represented as: C = c – nN + aA + tTĀ  where c, n, a, and t are constants and c estimate the total cost when the remaining variables are zero. Which of the following interpretations is true about this model?