To solve this problem, we can use a system of equations. Let the original salaries of Mahi and Chandu be $$x$$ and $$2x$$
According to the query, if the salary is increased by 4500, then we have:
$$\frac{x+4500}{2x+4500} = \frac{50}{67}$$

Solving the above equation, we get
$$67 \cdot(x+4500) = 50 \cdot (2x+4500)$$

$$67\cdot x + 67\cdot 4500 = 50\cdot2x + 50\cdot4500$$

$$67x + 301500 = 100x + 22500$$

$$301500 - 22500 = 100x -67x $$

$$33x = 76500$$

$$x = \frac{76500}{33}$$

$$x = 2318.18$$

The original salary of Chandu was $$2x = 2 \times 2318.18 $$

$$ = 4636.36$$

**Therefore, the original salary of Chandu was 4636.36**