A businessman advertised two job openings for peons in his firm. Two men applied and the businessman decided to engage both of them. He offered them a salary of $2,000 per year; $1,000 to be paid every half year, with a promise that their salary would be raised if their work proved satisfactory. They could have a raise of $300 per year, or if they preferred, $100 each half year. The two men thought for a few moments and then one of them expressed his wish to take the raise at $300 per year, while the other man said he would accept the half yearly increase of $100. Between the two men, who was the gainer, and by how much?