The average revenues of 7 consecutive years of a company is Rs 83 lakhs. If the average of first 4 years is Rs 78 lakhs and that of last 4 years is Rs 90Â lakhs, find the revenue for the 4th year.

• A. Rs 91 lakhs
• B. Rs 93 lakhs
• C. Rs 89 lakhs
• D. Rs 87 lakhs