Final answer:
Jack only received $1,200 from his disability insurance because there may be a waiting period before the policy starts paying benefits.
Step-by-step explanation:
The probable reason that Jack only received $1,200 from his disability insurance is that there may be a waiting period before the policy starts paying benefits. During this waiting period, Jack might not receive any payments. In this case, Jack has been disabled for 60 days, but he only received $1,200, which suggests that he may have a waiting period of 30 days before the policy starts paying benefits.