Ninety percent of service calls regarding kitchen appliances involve a minor repair. For example, the customer did not read the instructions correctly or perhaps failed to connect the appliances correctly. These service calls cost $50. Service calls for major repairs are more expensive. Sixty percent of service calls for major repairs cost the customer $300 or more. What is the probability that a randomly selected service call cost $300 or more?
The probability a randomly selected service call cost $300 or more is ?