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A dealer marks his goods 20% above cost price.He then allowed some discount on it and marks a profit of 12%.The rate of discount is:
A group of k employees from the IT giant Tirnop Inc. attend a conference. Suppose that for every integer i from 0 to 3, there is a set of 3 employees from this group such that exactly i pairs of these 3 employees are friends. What is the minimum possible value of k?