Answer:
7.14%
Explanation:
Tax rate applicable for John Richards =30%. So, Post Tax profit for corporate bond will be 70% (1 - 30%) of profit.
Required post tax profit from Corporate Bond is 5%.
Required pretax profit from Corporate bond = 5%/70% = 0.071429 = 7.14%
Therefore, to get 5% post tax profit from corporate bond, the interest rate needs to be set on 7.14% to produce the same amount of usable (after-tax) income.