Can anyone help me about this question? Two short questions of it. The first one is to calculate the YTM of each bond, the second ine is to claculate the whole YTM of this portfolio, and assume bonds are purchased in year 0. if you figure this out, i will appreciate a lot.

#2. A portfolio consists of 4 bonds (A,B,C,D) with equal weights. a) What are the YTMs of the individual bonds? In other words, calculate the YTMs of bond A, B, C. D, respectively. Assume that coupons are paid semi-annually. 2 b) What is the YTM of this portfolio? Assume that all the bonds are purchased in year 0