1 A foreign trade company in China signed a computer sales contract with Japan. According to the contract, each computer costs 300 USD CIF Osaka, and the transaction quantity is 1000, according to the invoice amount. 1.300 *1000 * (1+10%) = USD 330,000.

2. First, the conversion unit is 5000 tons =2500 metric tons.

[2500 * 3000 * (1+10%)] * (0.3%+0.2%) = 41.250 USD.

3. (1)10000+1500+1000 =12600 (2)10000 (Personal understanding: because the purchase price includes taxes.

(3)2000/ 12600= 15.87%

4. Commission price = net price divided by 1 minus commission rate, and commission = commission price-net price.

[450*200/( 1-2%)]-450* 120= 1836.73