Assume a hypothetical age for your child between 1 month to 24 months, you like to have $40,000 during the 4 college years expense of your child. To implement this strategy, you decide to buy a zero-coupon bond with a face value of $40,000, maturity will be when your child reaches the age of 18 years old, and the zero coupon bond yields 6.6 % semi-annual. What is your total investment today to achieve this goal?