舉例算high rate 和 investment rate

Security Term	CUSIP	Issue Date	Maturity Date	High Rate	Investment Rate
17-Week	912797FP7	02/21/2023	06/20/2023	4.800%	4.945%

就用hhtt的例子

High rate = annual discount rate = 4.8%

17 week = 17x7 = 119 days

discount rate for 17 weeks = 4.8% x 119/360 = 1.5867%

Price for 17 week treasury bill = 100 x (1-1.5867%) = 98.41333 (付$98.41買麵值$100的bill)

17 week 回報 = 100 -98.41333 = 1.586667

17 week 回報率= 1.586667/98.41333 = 1.6122%

Investment Rate = 年化回報率= 1.6122% x 365/119 = 4.945%