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1. : Purana and Naya two brand of mixer-grinder available in the market. Purana was introduced in 1990 and Naya was introduced in 1997. For both brands, 20% of the mixer-grinder bought in a particular year are disposed off as junk exactly two year later. It is known that 10 Purana mixer-grinder were disposed off in 1997. The following chart show the operation from 1995 to 2000, as at end of the year.
How many Purana mixer-grinder disposed off in 2000?
How many Purana mixer-grinder disposed off in 2000?
Solution:
Since, information of Purana mixer-grinder is not given for the even-numbered years (1996, 1998, etc), the number of mixer-grinder disposed off in 2000 cannot determined.