You own a bond with an annual coupon rate of $7\%$ maturing in two years and priced at $86\%.$ Suppose that there is a $10\%$ chance that at maturity the bond will default and you will receive only $44\%$ of the promised payment. Assume a face value of $$1,000.$

A$)$What is the bond$$s promised yield to maturity? $=15\mathrm{.}69\%$

B$)$ What is its expected yield $($i$.$e$.,$ the possible yields weighted by their probabilities$)?$ answer to A is $15\mathrm{.}69$ just need help with this one