Rahul spends $20\%$ of his monthly income on house rent, $25\%$ of the remaining on food, and $30\%$ of the remaining on education and medical expenses. If he is left with $\text{Rs. } 2100$ as savings, what is his monthly income?
Options:
- A: $\text{Rs. } 4500$
- B: $\text{Rs. } 5000$
- C: $\text{Rs. } 6000$
- D: $\text{Rs. } 7500$
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