What was the business proposal Damu Anna received from Mumbai, and why did it cause him turmoil?

Damu Anna received a business proposal via a letter from a friend in Mumbai concerning the cotton trade. As detailed in Chapter 25, his friend proposed a partnership to buy cotton, predicting that its price would rise instantly. The deal was presented as being 'clean and safe,' with a potential net profit of two lakh rupees, which would be split evenly between them for a one lakh rupee gain each. The letter urged Damu Anna to reply quickly and be 'smart,' warning that those who don't seize such opportunities end up repenting later. This proposal caused Anna's mind to be in a turmoil, likely due to the large sum of money involved and the pressure to make a swift decision on a high-stakes venture.