Today is 1 July 2021. Joan has a portfolio which consists of two different types of financial instruments (henceforth referred to as instrument A and instrument B). Joan purchased all instruments on 1 July 2016 to create this portfolio and this portfolio is composed of 344 units of instrument A and 426 units of instrument B. Instrument A is a zero-coupon bond with a face value of 100. This bond matures at par. The maturity date is 1 January 2030. Instrument B is a Treasury bond with a coupon rate of j = 3.26% p.a. and face value of 100. This bond matures at par. The maturity date is 1 January 2024. % p.a. (a) Calculate the current price of instrument A per $100 face value (today's value). Round your answer to four decimal places. Assume the yield rate is j =4.19% | a. 57.1320 O b. 55.9596 O c. 49.7688 O d. 70.2949