Dhruva gave 35% of her monthly salary to her mother. From the remaining salary, she paid 18% towards rent and 42% she kept aside for her monthly expenses. The remaining amount she kept in bank account. The sum of the amount she kept in bank and that she gave to her mother was Rs. 43,920. What was her monthly salary?

• A. Rs. 80,000
• B. Rs. 75,000
• C. Rs. 64,000
• D. Rs. 72,000