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The currencies of the two countries are exchanged for primary school mathematics! Want the process!
The first time from a to B 160/2*3- 16=224.

The second time from B to A 224/2*3- 16=320.

The third time from A to B 320/2*3- 16=464.

The fourth b to A 464/2*3- 16=680.

……680/2*3- 16= 1004

…… 1004/2*3- 16= 1490

...1490/2 * 3-16 = 2219, that is, 160 times 1.5 times X 1.5 minus1.

Because160 *1.5 *1.5 *1.5 *1.5 *. 10000

1* *11time