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f=0.03b represents the relationship between fee charged and amount of transfer.
Step-by-step explanation:
Given,
Amount of balance transfer = b
Fee charged on balance transfer = f = 3%
Amount of fee charged on balance transfer = 3% of amount of balance transfer
Amount of fee charged = 
Amount of fee charged = 0.03b
Therefore,
f=0.03b
f=0.03b represents the relationship between fee charged and amount of transfer.
Keywords: percent, division
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Answer:

Step-by-step explanation:
- Since 2 opposite add up to 0,remove them from the expression (+4ab, - 4ab)
2. Calculate the product