Now the stock index is 2600 points. If you buy a first-class stock index, it will rise by 1%, which is 26 points, and the profit and loss will be 26*300=7800.

18% deposit is 2600 * 300 * 0.18 =140400 7800/140400 = 0.555555.

So your profit-loss ratio is 0.55.