What was the business proposal that Damu Anna's friend from Mumbai sent him, and why was it so tempting?

The business proposal presented to Damu Anna is outlined in Chapter 25. A friend from Mumbai sent him a letter proposing a partnership in a cotton trading business. The proposition was highly tempting because it promised a substantial and quick profit. The friend's letter projected a net profit of two lakh rupees, which would be split equally between them, giving each partner a one lakh rupee share. The friend urged Damu Anna to act quickly and be 'smart,' emphasizing that the business was 'clean and safe' and that the price of cotton was expected to rise instantly. This sense of urgency and the promise of a large, easy profit created a turmoil in Damu Anna's mind.