The average revenues of 7 consecutive years of a company is Rs 71 lakhs. If the average of first 4 years is Rs 66 lakhs and that of last 4 years is Rs 78 lakhs. What is the revenue for the fourth year.
Total revenues of 7 years of the company = $$71 \times 7$$ = Rs. 497 lakhs
Total revenue of first 4 years = $$66 \times 4$$ = Rs. 264 lakhs
Total revenue of last 4 years = $$78 \times 4$$ = Rs. 312 lakhs
$$\therefore$$ Revenue of 4th year = (264 + 312) - 497 = 576 - 497
= Rs. 79 lakhs
=> Ans - (C)
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