Use the table for the question(s) below. Consider the following risk-free bonds with face value of $100 : a) What is the Macaulay duration of Bond A? b) What is the Macaulay duration of Bond B? c) What is the Macaulay duration of Bond C? d) What is the Macaulay duration of a portfolio that consists of a long position of $4000 in Bond A, a long position of $3000 in Bond B, and a short position of $2000 in Bond C