The average revenues of 7 consecutive years of a company

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The average revenues of 7 consecutive years of a company is Rs. 75 lakhs. If the average of first 4 years is Rs. 70 lakhs and that of last 4 years is Rs. 82 lakhs, what will be the revenue for the 4th year ?

1. Rs. 85 lakhs
2. Rs. 83 lakhs
3. Rs. 81 lakhs
4. Rs. 79 lakhs

Correct Option: B

Given , The average revenues of 7 years = Rs. 75 lakhs
The average revenues of first 4 years = Rs. 70 lakhs
The average revenues of last 4 years = Rs. 82 lakhs
According to question ,
Revenue of fourth year = Rs. (4 × 82 + 4 × 70 – 7 × 75) lakhs
Revenue of fourth year = Rs. (328 + 280 – 525) lakhs = Rs. 83 lakhs