Please solve question without using excel

Alpha is currently financed by three sources; Sources Bank Debt Bonds Equity Amount (RS) 12 Million 16 Million 22 Million Analysis of Alpha's accounts reveals that interest payment on bank loan is Rs. 900,000 per year. The company is subjected to a tax bracket of 35%. Bonds issued by Alpha bears a face value of Rs.1000, paying an interest of 10% and will mature in 5 years. These bonds are currently selling for Rs.785 per bond in market. Alpha has no plans to redeem these bonds. The Beta of Alpha's stock is 1.75. The one year T-bill rate is 8% while return on market portfolio is 12%. Required: Find Weighted Average cost of Capital of Alpha