Ram spends 20\% of his monthly income on rent. From the remaining amount, he spends 10\% on food, 30\% on travel, and 2/5 of the remaining amount on his mother. If the difference between the amount spent on travel and the amount given to his mother is Rs. 11,200, what is Ram's monthly income?

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**Solution:**

1. Let Ram's monthly income be $100x$.

2. Amount spent on rent = $20\%$ of $100x = 20x$.

3. Remaining income after rent = $100x - 20x = 80x$.

4. Amount spent on food = $10\%$ of remaining income = $10\% \times 80x = 8x$.

5. Amount spent on travel = $30\%$ of remaining income = $30\% \times 80x = 24x$.

6. Amount given to mother = $\frac{2}{5}$ of remaining income = $\frac{2}{5} \times 80x = 32x$.

7. According to the question, difference between amount spent on travel and amount given to mother is Rs. 11,200:

$$ 32x - 24x = 11200 $$

$$ 8x = 11200 $$

$$ x = \frac{11200}{8} = 1400 $$

8. Therefore, monthly income = $100x = 100 \times 1400 = Rs. 140,000$.

**Answer:** Rs. 140,000

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