Help me solve the foreign exchange problem in international finance.

1, USD/JPY 103.4 (buying price)/103.7 (selling price)

GBP/USD 1.3040 (buying price)/1.3050 (selling price)

Exchange rate setting for pound to buy yen: change pound into dollar first. At this time, the bank purchase price 1.3040, 1 pound can be converted into US dollars, and then US dollars can be converted into Japanese yen. At this time, the bank purchase price 103.4, 1 USD can be changed into 65438.

Then the conversion of pounds into yen is:1.3040 *103.4 =134.8336. Then the exchange rate for the company to buy yen sets in pounds is: 1: 134.83.

(GBP/JPY =1.3040 *103.40 ~1.3050 *103.70 =134.8336 ~135.33083.30008080806

2. USD/JPY 153.40 (buying price) /50 (selling price)

USD/7.80 10/0 (buying price) /20 (selling price)

Exchange rate of Japanese yen against Hong Kong dollar: first, change Japanese yen into US dollars at the bank selling price 153.50, then change US dollars into Japanese yen at the bank buying price of 7.80 10, and then change Japanese yen into Hong Kong dollars: 153.50=7.80 10, and Japanese yen/Hong Kong dollar = 7.8.

A company uses Hong Kong dollars to buy Japanese yen to pay for the goods, and the exchange rate between Japanese yen and Hong Kong dollars is: 1: 0.0508.

3, there is a problem!

4. USD/JPY 145.30/40

GBP/USD 1.8485/95

Exchange rate of Japanese yen against British pound: first, use the selling price 145.40 to convert Japanese yen into US dollars, and then use the selling price 1.8495 to convert US dollars into British pounds!

Yen/GBP =1.8495/145.40 ~1.8485/145.30 = 0.01272008 ~ 0.0120.

(or GBP/JPY =145.30 *1.8485 ~145.40 *1.8495 = 268.438+0 ~ 268.438+073).

5, (1) exists,

(2) Buy forward contracts at the exchange rate of 1.5000. And sell the 3-month contract at 1.5020!