Please explain a little bit why we should choose full cost 400 instead of 200

Ex 4 Multinational Transfer Prices Cambridge International has production and marketing divisions throughout the world. It produces one particular product in Ireland, where the income tax rate is 12%, and transfers it to a marketing division in Japan, where the income tax rate is 40%. Assume that Japan places an import tax of 10% on the product and that import duties are not deductible for income tax purposes. The variable cost of the product is 200 and the full cost is 400. Suppose the company can legally select a transfer price anywhere between the variable and full cost. 1. What transfer price should Cambridge International use to minimize taxes? Explain why this is the tax-minimizing transfer price. 2. Compute the amount of taxes saved by using the transfer price in requirement 1 instead of the transfer price that would result in the highest taxes. 13-5