มีใครทราบรบกวนช่วยหน่อยนะค่ะ

ต้องการทราบวิธีคำนวน หรือ วิธีแทนค่าลงในสูตรค่ะ ไม่ทราบว่าใช้สูตรไหน ใครรู้ช่วยทีค่ะ

Q1. RPZ Ltd. is a taxation category 2 company and has the following market value of capital structure
It is also given that the:
cost of bonds is 10% before tax, and cost of ordinary shares is 17% after tax.
Further, the issue price of the preference shares is $1.50 per share, and pays a dividend of $0.15 per share,

Bonds
700
Preference shares
100
Ordinary Shares
1200

Suppose that the company tax rate is 30%. Given this information:
i. Determine the after tax cost of capital for preference share.
ii. Determine the weighted average cost of capital.

----------------------------------------------------------------------------------------

Q.2 What is a firm’s weighted-average cost of capital if the share has a beta of 1.45, Treasury bills yield 5%, and the market portfolio offers an expected return of 14%? In addition to equity, the firm finances 30% of its assets with debt that has yield to maturity of 9%. The firm has a marginal tax rate of 35%. (Show the formulae and full calculations)

PV=PMT1−(1+i)−n/i+ FV/(1+i)n
R=D/V+g
RP = D/P