Answer:
22.7 %
Explanation:
We can solve two of the problems using Capital Asset Pricing Model (CAPM) which is as follows:
Ra= Rf + (Rm-Rf)*B
Where,
Ra= Rate of return on stock
Rm= Rate of return on market
Rf= Risk Free rate
B= Beta coefficient of stock
Now we can move for your problem
Prob1) Ra= .15, Rf= .08, Rm= .13, B= ?
.15=.08+(.13-.08)B
Therefore, beta Coefficient = 1.4
Prob2: Ra= ?, Rf= .04, Rm= .15, B=1.7
= .04+(.15-.04)*1.7
Therefore, Ra=0.227 = 22.7 %