Carol has lent $60 000 at 5% interest per annum to the firm in which she is a partner. A company has offered to buy the partnership business. Part of the purchase price consists of a debenture to be issued to Carol to ensure that she continues to receive the same amount of interest annually as she had been receiving from the partnership. 

Required 

(a) Calculate the amount of the debenture to be issued to Carol if the debenture carries interest at 8% per annum. 

(b) Calculate the amount of the debenture if it carries interest at 4% per annum.