Pegasus Inc. wants to purchase Noritake Snowflake china for the executive boardroom from either Sears or Macy's or both department stores. The probability of Sears having this china in stock is .8, the probability of Macy's having this china in stock is .6, and the probability of both stores having this china in stock is .45. Find the following probabilities: a. Sears or Macy's has the dishes in stock? b. Sears has the dishes in stock and Macy's does not? c. Both Sears and Macy's are out of stock?