1.

1). Rs. 202). Rs. 263). Rs. 174). Rs. 22

Answer»

⇒ Average = SUM of elements / number of elements

Given,

The average price of bunch of rings is Rs. 45.

Let the number of rings in a bunch be N.

⇒ Total price of N number of rings = 45 × N

The GOOD 45% of them is of average price of Rs. 60 and DAMAGED 20% of average price of Rs. 55.

⇒ Number of good rings in bunch = (45/100) × N = 9N/20

⇒ Total price of good rings = 60 × (9N/20) = 27N

⇒ Number of damaged rings in a bunch = (20/100) × N = N/5

⇒ Total price of damaged rings = 55 × (N/5) = 11N

Total number of remaining rings =

= 100 - (45 + 20)

= 35%

Total number of remaining rings =

= (35/100) × N

= 7N/20

Total price of remaining rings =

= 45N - (27N + 11N)

= 7N

Total number of remaining rings = 7N/20

Average price of remaining rings =

= Total price of remaining rings / number of remaining rings

= 7N/ (7N/20)

= 20

Average price of remaining rings IS Rs. 20.



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