You want to buy soybeans and you have $500USD to spend. The domestic price is $0.8USD per pound. You can also buy soybeans with free shipping from Japan and China. The price in Japan is 600 yen per pound and the price in China is 60 yuan per pound. The spot US-JP exchange rate is 660 Japanese Yen and the JP-CN exchange rate is 0.105 Chinese Yuan. What is the maximum quantity of soybeans that you can afford to buy?