Question

Need help with this question (:

A certain bank assigns one unique number to each savings account. The amount of savings in each account depends on how much the owner deposits into the account. The interest paid on each account depends on how much money is in the account.

Which of these relations is not a function?

(interest paid, savings account number)
(interest paid, amount in savings account)
(savings account number, interest paid)
(savings account number, amount in savings account)

Answer 1

anyone?