give full explanation

Cast Construction's stock is currently selling at $30 per share. The firm is a mature firm and it has been experiencing a 6% annual growth rate. The risk free rate is 8% and the market portfolio risk premium is 5%. If systematic risk increases by 50%, buy how much the share price will increase or decrease? Not solved

a. increase by $7.31

b. Need more information to answer the question.

c. increase by $4.05

d. decrease by $7.31

e. decrease by $4.05