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Directions for the following four questions: Answer the questions on the basis of the information given below.
Purana and Naya are two brands of kitchen mixer-grinders available in the local market. Purana is an old brand that was introduced in 1990, while Naya was introduced in 1997. For both these brands, 20% of the mixer-grinders bought in a particular year are disposed off as junk exactly two years later. It is knows that 10 Purana mixer-grinders were disposed off in 1997. The following figures show the number of Purana and Naya mixer-grinders in operation from 1995 to 2000, as at the end of the year.
There were 30 naya mixture in 97' which will also work in 98' ,thus we have 50 new mixtures in 98' . Now in 99' 20% of 30 i.e. 6 are thrown in junk . So in 99' we have 24 + 50 = 74 naya mixtures of previous years. So naya mixture grinder purchased in 99' is 124-74 = 50. Hence option b.
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