Langston Labs has 10 million shares of common stock outstanding. The book value is $58 per share and its current market price is $62 per share. The firm just paid a dividend of $1.80, and its expected dividend constant growth rate is 6%. The corporate tax rate is 35%. The firm just issued a 400 million bonds at a cost of 6%. What's the firm's WACC? 7.55%7.05%6.93%7.90%6.65%