Gongju Industrial's total assets are 10 million won. Gongju Industrial believes that the following capital structure is optimal.

The data on securities issued by Gongju Industrial are as follows, and the corporate tax rate is 40%.

Debt of 50 million won, preferred stock of 125 million won, common stock of 125 million won, total capital of 10 million won.

(1) Corporate bonds issued by Gongju Industrial are traded at face value, with a surface interest rate of 7%.

(2) Preferred stocks are priced at 25,000 won and dividends are 3,000 won, and dividends at this level are expected to continue permanently.

(3) Common shares are currently traded at 15,000 won in the market, and the estimated dividend amount at the end of the current period is estimated at 1,350 won, and the profits and dividends of common shares of the Gongju industry are expected to continue to grow by 6% per year in the future.

The answer indicated by the prime number should be rounded to the third decimal place!

1. What is the post-tax debt cost of the Gongju industry?

%

2. What's the cost of preferred stocks in Gongju Industrial?

3. What is the cost of capital stock of Gongju Industrial?

%

4. What is the weighted average capital cost of the Gongju industry?