Start: A has 0 yuan RMB, and B has $65,438 +0. The exchange rate is 1:6.

Then A borrows money from B and borrows a dollar. At this time, A is the debtor and B is the creditor. At this time, their money is:

A has $ 1, B has $0 or A has 6 yuan RMB, and B has $0. The exchange rate is still 1:6.

Then the exchange rate rose to 1:7. At this time, if Party A repays Party B, it is:

A has 0 USD, B has/kloc-0 USD or A has 0 RMB and B has 7 RMB. The exchange rate is 1:7.

Look who did it.