$***$YTC$,$ YTM$,$ and holding period yield they all refer to the $r$ in the formula:

$P=C^{**}\frac{1-\frac{1}{(1+r{)}^{{?}^{{?}^{?}}}}t}{r}+\frac{F}{(1+r{)}^{{?}^{{?}^{?}}}}t.$ They are just different expressions under different circumstances.

$9.$ What is the yield to call $($YTC$)$ of a $30-$year $6\%$ bond selling for $$940?$ The call deferment period for the bond is $10$ years. Call premium $=30.$

$[$Hint: It means that your $N=10**2=20,$ and your face value $=1030]$

$10.$ What is the yield to call $($YTC$)$ of a $20-$year $8\%$ bond selling for $$1030?$ The call deferment period for the bond is $5$ years. Call premium $=40.$

$[$Hint: It means that your $N=5**2=10,$ and your face value $=1040$

$11.$ Still considering the same bond as question $10,$ suppose you buy it today, but expect to sell it in $2$ years at a YTM $=4\%.$ That is$,$ you expect the yield to maturity on this bond to be $4\%$ when you sell it in $2$ years. What price do you expect to sell it for? What is your expected holding period yield if you buy it today and sell it at the expected sell price?

$12.$ What is the holding period yield on a $30-$year $7\%$ bond that we buy for $$1050.$ We sell the bond in $4$ years for $$1090.$

$13.$ Suppose you bought a $20-$year $8\%$ bond for $$1075.$ If you sold the bond for $$980$ after holding it for $2$ years, what was your holding period yield?