On August 2, when the filed financing statement in favor of the Last National Bank covered "all business machines," the debtor engaged in the transactions listed below. Decide for each transaction if the bank should take action before August 23 or if the financing statement is sufficient as filed: (a) The debtor traded a computer for another computer. (b) The debtor traded another computer for a painting to be hung in the office. (c) The debtor traded a duplicating machine for a used car (and state law requires a lien interest in a vehicle to be noted on the certificate of title as the sole means of perfection). (d) The debtor sold a calculator to a friend for cash and that same day used the cash to buy a painting to hang in the office. (e) The debtor sold an adding machine for $500 and put the cash in a bank account at a different bank; on August 2, that bank exercised its right of setoff against the account. See 9-340. (f) The debtor sold a coffee maker for $200 and gave the money to a Salvation Army volunteer that same day; see 9-332(a)