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Q.

The monthly sales for the first 11 months of the year of a certain salesman were Rs. 12,000 but due to his illness during the last month the average sales for thewhole year came down to Rs. 11,375. The value of the sale during the last month was

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a

Rs 4,500

b

Rs 6,000

c

Rs 10,000

d

Rs 8,000

answer is A.

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Detailed Solution

Let Rs. x be the sale in the last month. Usingthe formula of combined mean, we have12,000×11+x12=11,375 ∣x=11,375×12−12,000×11 =1,36,500−1,32,000=4500.
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The monthly sales for the first 11 months of the year of a certain salesman were Rs. 12,000 but due to his illness during the last month the average sales for thewhole year came down to Rs. 11,375. The value of the sale during the last month was