explain step by step of each part

- Consider a firm that has a zero-coupon bond that matures in 4 years. The face value is $30 million, and the risk-free rate is 6%. The current market value of the firm's assets is $40 million, and the firm's equity is currently worth $18 million. - Suppose the firm is considering a project with an NPV=$500,000. - What is the implied standard deviation of returns? - What is the delta? - What is the approximate change in stockholder value from an NPV of $500,000