Janice has the uncle who offers her given choices: her uncle will pay her $1,000 on first day of month, then on 2nd day he will pay her one dollar less, and 3rd day one dollar less, and this would carry on for 1000 days. Or she may select for him to pay her $1 for first day of month, then receive double next day, and double following day, and this would continue for 19 days. After doing computations which one must she select, why, and what would be actual difference?