Answer & Solution
Answer: Option B
Solution:
It is given that 20% of the mixer-grinders are disposed off after 2 years.
There for in 1999, 5 mixer-grinder disposed off (20% of 25).
Also the number of mixer grinder in circulation in 1999 was 120 and 1998 was 75. The difference is 45.
The total number of mixer-grinder purchased is (45 + 5) = 50