Answer:
Ans. YTM=8.9805%
Step-by-step explanation:
Hi, first we need to determine the coupon for every semester and construct a table in order to use the "IRR" function of microsoft excel. Everything should look like this.
face value $1.000
Price $1.100
time 15 years to maturity
coupon 10% annual
5% semi annual
coupon(semi anual) $50
0 -$1.100
1 $50
2 $50
3 $50
4 $50
5 $50
6 $50
7 $50
8 $50
9 $50
10 $50
11 $50
12 $50
13 $50
14 $50
15 $50
16 $50
17 $50
18 $50
19 $50
20 $50
21 $50
22 $50
23 $50
24 $50
25 $50
26 $50
27 $50
28 $50
29 $50
30 $1.050
There are 30 periods since the coupon is to be paid semi annually, the coupon is calculated as follows.

Notice that the value of period 0 is -1100, corresponds to the amount of money paid for the bond and is negative because, well, we paid for it. This is very important because when you use the IRR formula of MS Excel, it requires at least 1 change of sign to work properly.
So the answer at this point is 4.3937% but remember that the cash flow took place in a semi-annual fashion, therefore, we have to make it annual, this is the math to that.

Best of luck.