What was the business opportunity presented to Damu Anna that caused him so much turmoil?

A friend of Damu Anna's from Mumbai sent him a letter proposing a partnership in a cotton trading business. Chapter 25 details this proposal, which promised a substantial net profit of two lakh rupees, to be split evenly between the two partners. The friend urged Damu Anna to act quickly and be 'smart,' describing the business as 'clean and safe' and warning that those who fail to seize such timely opportunities often repent later. The letter's proposition to buy cotton with the expectation that the price would rise instantly is what put Damu Anna's mind 'in a turmoil,' as he was faced with a high-stakes decision that promised great wealth but also involved significant risk and pressure.