Solution of problem N3940 probability theory total prob

Solution of problem N3940 probability theory total prob

3940. Watches are made in three factories and go to the store. The first plant produces 40% of all products, the second - 35%, the third - 25%. Of the products of the first plant, 10% are in a hurry, in the second - 15%, in the third - 20%. What is the probability that a purchased watch is in a hurry?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)