Krishnaiah gave 30% of his retirement benefits to his wife. From the remaining amount he distributed 20% each to his 2 children. From the remaining, 50% of the amount he donated to a school. If the final balance left with him is Rs. 42,000, what was his total amount of retirement benefits?

• A. Rs. 2,20,000
• B. Rs. 1,80,000
• C. Rs. 2,00,000
• D. Rs. 2,10,000