need help with homework problems

1. discount on a 180 day note if the interest rate is 16.7% and the maturity value is $8,500.

2.) If the consumer receives proceeds of $2,475.00 on a 90 day note with a discount rate Find the of 15.5%, then what is the maturity value?

3). To the nearest day what is the time period on a 9% note if the bank discount is maturity value is $8,000 and the proceeds to the borrower are $7,840?