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?

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