Explanation:

- Let's assume the man's monthly salary is Rs $S$.

- He deposits 10% of his salary in PF, so he has $S-0.1S=0.9S$ left.

- He saves 30% of the remaining amount:

$$\text{Saved Amount}=0.3\times 0.9S=0.27S$$

- Remaining salary after saving is:

$$0.9S-0.27S=0.63S$$

- Given that the ratio of expenses on medicine to groceries is 3:4, and the expense amount on medicine is Rs 2700, we can find $\frac{3}{7}$ \ of the remaining salary is Rs 2700:

$$\frac{3}{7}\times 0.63S=2700$$

- Solving for S:

$$0.27S=2700$$

$$S=\frac{2700}{0.27}=10000$$

- Rs 10,000

-