Final answer:
The scenario described is an example of a life annuity, where Joanna continues to receive $200 monthly after Tom's death.
Step-by-step explanation:
This scenario is an example of a life annuity. A life annuity is a financial contract that provides a stream of income for the rest of an individual's life. In this case, Joanna and Tom had a $40,000 annuity that paid them $200 a month, and when Tom dies, Joanna continues to receive the $200 monthly check as long as she lives.