20.32Suppose affiliate A sells 10,000 chips monthly to affiliate B at a unit price of $15. A's tax rate is 45% and B's tax rate is 55%. In addition, B must pay an ad valorem tariff of 12% on its imports. If the transfer price on chips can be set anywhere between $11 and $18, how much can the total monthly cash flow of A and B be increased by switching to the optimal transfer price?

a)$3,000

b)$4,000

c)$1,840

d)$1,380

The correct answer is d) $1,380.

Can you please provide a written solution to this problem as I am not able to solve the question.