the records of a computer retail store show that out of the 50 customers who purchased a desktop computer last month, all but 12 also purchased a service plan that extends the warranty for an extra year. out of the 100 customers who purchased a notebook computer last month, all but 10 purchased the same service plan. last month, customers of the store who purchased ___ computers were less likely to purchase the service plan. That is because only __% purchased the service plan, whereas ___% of the customers who bought ___ computers purchases the service plan.