For (a) I have slightly different values than yours for both bonds. I priced 'em both using semiannual compounding (i.e. 1% per semiann period). I can see that you used annual compounding for Bond A, and you're a price is correct under an annual compounding assumption. Check your text for the requested compounding frequency. Also, show how you arrived at your price for B.
For (b) the problem gives you a very simple outcome space for risk-neutral pricing: The bond holders have a 90% probability of receiving ALL the promised cash flows of A, and a 10% chance of receiving nothing. For B, they have 78% odds of getting everything as scheduled, and 22% odds of getting zilch. In other words, it's "all or nothing" for both securities.
This immediately simplifies to
[Price considering default possibility] = [Price without considering default possibility] x [Probability of NOT defaulting]
For (c), redetermine A's risk-neutral price assuming a 25% default probability. Compare it to A's RN price you figured in part (b). The excess of A's RN price in part (b) over its RN price with a 25% default probability, is the value provided by the covenant.
An equivalent approach to (c) is to notice that the covenant gets the bond holders an extra 15 percentage points of probability of receiving the maturity payoff for A. So the covenant generates value equal to 15% of A's no-default present value.
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