please add explanation with the answer.

QUESTION 9 What price did Bill pay for a 182-day T-bill that had an interest rate of 8.1% p.a, and a face value of $55,000? QUESTION 10 An interest bearing promissory note for 90 days at 5.646 p.a. has a face value of $120,000. If the note is discounted 20 days after the issue date at a rate of 7.8% p.a., calculate the amount of discount