The records of a computer retail store show that out of the 25 customers who purchased a desktop computer last month, all but 8 also purchased a service plan that extends the warranty for an extra year. Out of 100 the customers who purchased a notebook computer last month, all but 41 purchased the same service plan.

To find the number of customers who purchased a desktop computer without the service plan, subtract the number of customers who purchased both the desktop computer and the service plan from the total number of customers who purchased the desktop computer:

Customers who purchased a desktop computer without the service plan = Total number of desktop computer customers - Customers who purchased both desktop computer and service plan
Customers who purchased a desktop computer without the service plan = 25 - 8 = 17

To find the number of customers who purchased a notebook computer without the service plan, subtract the number of customers who purchased both the notebook computer and the service plan from the total number of customers who purchased the notebook computer:

Customers who purchased a notebook computer without the service plan = Total number of notebook computer customers - Customers who purchased both notebook computer and service plan
Customers who purchased a notebook computer without the service plan = 100 - 41 = 59

Therefore, 17 customers purchased a desktop computer without the service plan, and 59 customers purchased a notebook computer without the service plan.