(3) Bond A is a zero coupon bond with a face value of 1,000 yuan and a maturity of 1 year, and the market price is 925.92 yuan; bond B is a zero coupon bond with a face value of 1,000 yuan and a maturity of 2 years, and the market price is 826.45 yuan. Please give the results of a) the 1-year spot rate ; b)the 2-year spot rate; c) the forward rate f1.2