What was the cotton business proposal that Damu Anna received from his friend?

Chapter 25 narrates a story about a business proposal that caused Damu Anna some turmoil. A friend from Mumbai sent him a letter proposing a partnership in the cotton trade. The friend was very persuasive, claiming it was a 'clean and safe' business that would yield a net profit of two lakh rupees, which would be split evenly between them for a one lakh profit each. He urged Damu Anna to be 'smart' and send a quick reply, emphasizing that the price of cotton was about to rise instantly and that those who fail to seize such an opportunity end up repenting. This urgent proposal left Anna's mind 'in a turmoil'.