Based on the information given the gain or loss percent on the whole transaction is 2%.
First step is to calculate the profit on the whole transaction
Profit=(8%×8,000)-(4%×8,000)
Profit=640-320
Profit=320
Now let calculate the profit percentage on the whole transaction
Profit percentage=320/(8000+8000)×100
Profit percentage=320/16000×100
Profit percentage=2%
Inconclusion the gain or loss percent on the whole transaction is 2%.
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