Answer:
b. $360,000.
Explanation:
Data provided in the question
Purchase value of the patent = $720,000
At the time of purchase, the patent life is 15 years
And, the useful life of the patent is 10 years
So, the amortization expense recorded value is
= $720,000 ÷ 10 years × 5 years
= $360,000
The five years is counted from the year 2006 to the year 2011