WACC Confusion.

Following is the question: Ingham's plc capital structure is as follows: 50c ordinary shares = $12m 8% $1 preference shares = $6m 12.5% loan notes 20X6 = $8m The loan notes are redeemable at nominal value at 20X6. The current market prices of the company's securities are as follows: 50c ordinary shares = 250c 8% $1 preference shares = 92c 12.5% loan notes 20X6 = $100 The company is paying corporation tax at rate of 30%. The cost of company's ordinary equity capital has been estimated at 18% pa. What is the company's weighted average cost of capital for capital investment appraisal purposes? (End of Question) Now I get it that the formula to solve this question is (Ve/Ve +Vd +Vp) x Ke +(Vp/Ve +Vd +Vp) x Kp + (Vd/Ve+Vd+Vp) x Kd(1-T) But still this formula is not giving me the right answer. I don't know whether I'm putting the formula wrong or values. Can anyone tell me its solution with clear workings so that I can understand the answer to this question. I will be very thankful to the person who solves this for me. It's correct answer is 16.29% Awaiting for response. Thanks.