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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 known 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.

     

How many Purana mixer-grinders were disposed off in $2000$?

  1. $0$
  2. $5$
  3. $6$
  4. Cannot be determined from the data
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I guess there’s something wrong with this question as there are $2$ conflicting pieces of information.

  1. $20\%$ of new products bought in a particular year, is disposed off $2$ years later
  2. $236$ operational products were present at the end of the year $1999,$ and a same number of products are present at the end of the year $2000.$

$2^{nd}$ info indicates that none of the newly bought products from the year $1998$ were discarded, but that is a direct contradiction to the $1^{st}$ information.

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