a) Janet borrows $4,000 on October 20, 2020. If the simple interest rate is 12%, then how much needs to be repaid on May 11, 2021?

b) On January 7, 2018, $4000 was deposited into an account which earns 5% annually. Assuming simple interest is allowed for part of a conversion period, how much will be in the account on April 20, 2025?

c) Bozo owes $4000 due in one year and $8,000 due in six years. Unfortunately, due to lack of attendance at the circus, Bozo is unable to meet the $4000 obligation. By mutual consent with the lender Bozo is allowed to pay off both loans after 4 years at 8% monthly. How much does Bozo pay?

d) Bozo borrowed $10,000 from Ernie due in 4 years at 6% compounded monthly. Immediately after the debt is contracted, Ernie sells the note to Max for an amount based on 5% compounded monthly. How much does Ernie receive?

* If it is alright with someone, can you please assist me with each of these parts here? I am having trouble trying to understand on how to go about figuring them out. All of the parts count as one problem, so I would really appreciate the help. Thanks!