First, write down all the earnings and dividend values for the next 10 years for example. Once you know how it's structured, use equations to calculate your values.
Dividend:
Year Value
0 0.00
1 0.00
2 0.05
3 0.05
4 0.05
5 0.5 * EPS
6 0.5 * EPS
7 0.5 * EPS
n 0.5 * EPS
Earnings (EPS):
Year Value
0 ?
1 0.20
2 0.20 * 1.07
3 0.20 * 1.07^2
4 0.20 * 1.07^3
5 0.20 * 1.07^4
6 0.20 * 1.07^5
7 0.20 * 1.07^6
n 0.20 * 1.07^(n-1)
Now you should have all the nominal values (a solid number) for EPS and Dividends for every year into infinity.
Since you're using DDM (dividend discount model) I'm assuming, you're looking at the present value of all future dividends. Looking here, there are 2 parts to value separately, a 3 year annuity that's 1 year delayed into the future (eg. pays at year 2-4), and a growing (geometric) perpetuity that's 4 years delayed (eg. pays starting on year 5). This should be obvious to you, hopefully. The annuity, since it's only 3 payments, can be discounted as 3 individual payments if you feel that using a more complex equation isn't worth the effort.
It says you have a required return of 15%/year. Therefore, discount these payments by 15%.
3-year annuity:
P = R * [[(1-(1+i)^(-n)]/i] = 0.05 * [[1-(1+0.15)^(-3)]/0.15] = 0.114161
This is the value of a 3 year annuity starting today (paying year 1-3). Since it is 1 year delayed (paying yeah 2-4), we discount that back another 1 year.
0.114161 / 1.15 = 0.099271
Perpetuity:
It's complicated because it's a growing geometric series that goes on to infinity, being discounted as well. I tried out various things on excel to get the numbers I needed (excel can get you all the answers you need in real life, if you weren't trying to "prove" things... eg. just get the solution). But, here's the explanation.
You have an infinite geometric series starting with a payment of 0.2, and discounted 15%/year as well. That means at time 0 (if you were to be paid based on the annuity since time zero) the annuity would pay 0.2/1.07 = 0.186916. We will need to discount by 15% as we increase the EPS by 7%, so the growth rate of the discounted EPS is 1.07/1.15 = 0.930435.
Subbing into the geometric series equation:
P = a / (1 - r) = 0.186916 / (1- (1.07/1.15)) = 0.186916 / 0.069565 = 2.686916
This value is of the discounted geometric series starting at time 0. 2 adjustments to make: 1) remove the payments from time 0 to time 4 (as the payments we actually want start at time 5), and also 2) divide that value by 2, as you are only paid half of the EPS.
For time reasons, the results are shown below, you should be able to calculate this yourself:
Payments year 0 to 4 are:
0.186916
0.200000
0.214000
0.228980
0.245009
Discounted at 15% is:
0.186916
0.173913
0.161815
0.150558
0.140084
Sum is:
0.813286
Subtract this from the total geometric series:
2.686916 - 0.813286 = 1.873630
Divide this by 2 as you are only paid half of the EPS:
1.873630 / 2 = 0.936815
Add this to the PV of the 3 year annuity (1 year delayed):
0.936815 + 0.099271 = 1.036085
So, your valuation should be $1.036085/share.
May be a shorter method to this, but this gets it done. When I do finance questions, I always model it out on excel for verification / 'knowing the answer before I do the question'. The modeling helps layout what payments come when, and also let you quantitatively find the answer. Eg. right now i have the thing modeled for 300 years (which makes the PV of payments < 0.00000005) and i get the same answer to the 6th decimal place.