Need Help in this one too! Thank you.

Imputed Interest. Jane loans $80,000 to John, her son, to permit him to purchase a principal residence. The loan principal is secured by John's residence, but the agreement does not specify any interest. The applicable federal rate for the year is 8%. John's net investment income is $800. a. How much interest is imputed on the loan each year? b. Assume that the amount of the loan is $125,000. How much interest is imputed on the loan? c. Is John allowed to deduct the imputed interest? d. What other tax implications are there for the loan