Final answer:
The total amount of interest paid over the life of the bonds is $120,000.
Step-by-step explanation:
The total amount of interest paid over the life of the bonds can be calculated using the formula:
Total Interest = Face Value * Interest Rate * Number of Periods
In this case, the face value of the bonds is $100,000, the interest rate is 6%, and the life of the bonds is 10 years, with interest paid semiannually. So, the total amount of interest paid over the life of the bonds would be:
Total Interest = $100,000 * 0.06 * 20 = $120,000
Therefore, the correct answer is d. $120,000.