A man deposits 10\% of his salary in Provident Fund (PF). He saves 30\% of the remaining amount. The ratio of his expenses on medicine to groceries is 3 : 4 of the remaining salary after saving. If his expense on medicine is Rs 2700, what is his monthly salary?

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**Solution:**

1. Let the monthly salary be Rs $100x$.

2. The man deposits 10\% of his salary in PF, so the remaining salary after PF deduction is:
   
   $$100x \times \frac{90}{100} = 90x$$

3. He saves 30\% of this remaining amount, so the amount left after saving is:
   
   $$90x \times \frac{70}{100} = 63x$$

4. The expenses on medicine and groceries together are in the ratio 3 : 4. Let the common factor be $y$, so total expenses are:
   
   $$3y + 4y = 7y$$

5. According to the problem, these expenses equal the remaining salary after saving:
   
   $$7y = 63x \implies y = 9x$$

6. Given the expense on medicine is Rs 2700, which is $3y$:
   
   $$3y = 2700 \implies y = 900$$

7. From step 5, $y = 9x$, so:
   
   $$9x = 900 \implies x = 100$$

8. Therefore, the monthly salary is:
   
   $$100x = 100 \times 100 = \text{Rs } 10,000$$

**Answer:** Rs 10,000

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