After spending 2 weeks’ holiday in China, Ken buys a saloon car weighing 40 piculs in the local unit of mass: given that 1 picul = 100 gins, 1 gin = 16 tahils, 1 tahil = 10 chees and 1 chee = 12 hoons. The weight of 1 hoon corresponds to a mass of 0.4 g. How much mass in tonnes will Ken declare on the shipment of the car?