Question : The average revenue for seven consecutive years of a company is Rs. 75 lakhs. If the average of the first 4 years is Rs. 70 lakhs and the last 4 years is Rs. 82 lakhs, what will be the revenue for the 4th year?
Option 1: Rs. 85 lakhs
Option 2: Rs. 83 lakhs
Option 3: Rs. 81 lakhs
Option 4: Rs. 79 lakhs
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Correct Answer: Rs. 83 lakhs
Solution :
Total revenue for 7 years = 75 lakhs $\times$ 7 = Rs. 525 lakhs
Total revenue for first 4 years = 70 lakhs $\times$ 4 = Rs. 280 lakhs
Total revenue for last 4 years = 82 lakh $\times$ 4 = Rs. 328 lakh
Total revenue for the first and last 4 years = 280 + 328 lakhs = Rs. 608 lakhs
$\therefore$ Revenue for the fourth year
= Total revenue for the first and last 4 years – Total revenue for 7 years
= 608 – 525 lakhs
= Rs. 83 lakhs
Hence, the correct answer is Rs. 83 lakhs.
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