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Q.

The average costs of ‘12’ different articles is 72. If cost of each article is decreased to its 14th, then what is the new average costs of 12 articles ?

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a

16

b

14

c

20

d

18

answer is B.

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Detailed Solution

Avg cost of 12 articles = 72

Total cost = 72×12= 864

Decreased cost = 14×864=216

New avg cost = 21612=18

Or

Avg cost of 12 articles = 72

New Average = 724=18

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