Question

How many Naya mixer-grinders were disposed off by the end of 2000?

Answer 1

Correct Answer: 22

We are told that 20% of the mixer-grinders bought in a particular year are disposed off exactly two years later. Let’s calculate the number of Naya mixer-grinders disposed by the end of 2000.

🔹 Naya was introduced in 1997, so the first disposals happen in 1999. 

Disposals:
• From 1997 purchases → disposed in 1999:     20% of 1997 Naya = 20% of 30 = 6
• From 1998 purchases → disposed in 2000:     20% of 1998 Naya = 20% of 80 = 16 

Total disposed by end of 2000 = 6 + 16 = \(\boxed{22}\) 

Answer 2

We are given the number of Naya mixer-grinders in operation at the end of each year. Let’s calculate how many were purchased in 1999.

Approach: Number in operation in 1999 = = Previous year's total (1998) + New purchases in 1999 − Disposals in 1999 

From the table: • Naya in 1998 = 80 • Naya in 1999 = 124 • Disposals in 1999 = 20% of 1997 purchases = 20% of 30 = 6 

So, 124 = 80 + Purchases in 1999 − 6 ⇒ Purchases in 1999 = 124 − 80 + 6 = \(\boxed{50}\) 

Answer 3

How many Purana mixer-grinders were purchased in 1999?

Approach:
Number in operation in 1999 = = Number in 1998 + Purchases in 1999 − Disposals in 1999

From the data:
• Purana in 1998 = 208 • Purana in 1999 = 177 • Disposals in 1999 = 25% of 1996 purchases = 25% of 124 = 31

Now apply: 177 = 208 + Purchases − 31 ⇒ Purchases = 177 − 208 + 31 = \(\boxed{0}\)

Answer 4

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

Approach:
Disposals in 2000 = 25% of 1997 purchases

From the data:
• Purana purchases in 1997 = 76

So, Disposals in 2000 = 25% of 76 = \(\boxed{19}\)