Man gives 50% to his son and 30% to his daughter. Now, he is left with 20%. He donated 80% of this remaining amount(20%) to a trust. Remaining amount is, 20 % of 20 % = 1/25 This is equal to 16,000 1/25 x = 16,000 x = 4,00,000 Hence, option B is the correct answer.