The fee for a balance transfer is 2% of the amount of the transfer. If b represents the amount of the balance transfer and ƒ represents the amount of the fee, which of the following equations represents the relationship between b and ƒ?
b = 0.2ƒ
ƒ = 0.02b
b = 0.2 + ƒ
ƒ = b + 2