Celine issues a ninety-day negotiable promissory note payable to the order of Hayden.The amount of the note is left blank, pending a determination of the amount that Hayden will need to purchase a used car for Celine. Celine authorizes any amount not to exceed $2,000. Hayden, without authority, fills in the note in the amount of $5,000 and thirty days later sells the note to First National Bank of Oklahoma for $4,850. Hayden does not buy the car and leaves the state. First National Bank has no knowledge that the instrument was incomplete when issued or that Hayden had no authority to complete the instrument in the amount of $5,000. (See Holder in Due Course.) 

(a) The first group will determine whether the bank qualifies as a holder in due course and, if so, for what amount.

(b) The second group will decide what would have happened if Hayden had sold the note to a stranger in a bar for $500. Would the stranger qualify as a holder in due course? Explain.