Final answer:
The primary policy will pay $30,000 for the injuries.
Step-by-step explanation:
The primary policy will pay $30,000 for the injuries.
Under Norris's policy, the liability limits are 50/100/50. This means that the policy will pay up to $50,000 for one person injured in an accident, up to $100,000 for all injuries in an accident, and up to $50,000 for property damage.
Since there are three people injured in the accident, Norris's policy will pay the maximum limit of $50,000 per person, which amounts to $150,000 in total. However, Arnold's policy will only pay up to $25,000 per person injured (as per the liability limits of 25/50/10). Therefore, the primary policy will pay a total of $75,000 for the injuries, which is $25,000 for each person injured.