A firm has sales of $10$ lakhs, variable cost of $7$ lakhs and fixed costs of $200000,$ and debt of $5$ lakhs at $10\%$ rate of interest. What are the operating, financial and combined $($total$)$ leverages? If the firm wants to double its Earnings before Interest and Tax $($EBIT$),$ how much of a rise in sales would be needed on a percentage basis?