hi, need a detailed explanation, thank you

CASE 1: (Bond Valuation) Apex Holdings is one of the renowned fund management companies in Australia. An individual investor has asked Apex service to manage his fund. Investor's expectation is only to invest in Bonds with maturity period of greater than 4 years. As a finance analysist of Apex following are the option for review. Bond Maturity Coupon rate Face Value Coupon X 10 Years 2% $1,000 Annual Y 7 Years 5.5% $1,000 Semi Annual Z 5Years 10% $1,000 Annual Apex minimum required rate of return (yield to maturity of the bonds) is 7% for similar kind of bonds. Required: a. Calculate the maximum price would you recommend paying for each of the above bonds and assess whether they are discount, premium or par bond. b. If market will recover after Covid 19 pandemic, Apex wishes to increase the required rate of return from 7 % to 8%. What prices would you be willing to pay now for each bond? c. What is the percentage change in prices for each bond in (b) compared to the prices obtained under (a) above? d. Which of the three bonds is least sensitive to market interest rate change? Which one is most sensitive? Explain your reasoning. e. Which bond(s) will you buy if your required rate of return is 7% and the market price for each bond is as follows? Why? X - $670.55 Y - $897.25 Z-$1,203.80