According to the needs of its production and operation, an enterprise is ready to make a one-time investment of 1 million yuan in the fixed assets project. The fixed assets can be used for 6 years, depreciated according to the straight-line method, and have a residual value of 100,000 yuan at the end of the period. The net profit created for the enterprise in each year after the construction is put into production in the same year is shown in Table R.

(1) Calculate the payback period of the investment project;

(2) Calculate the net present value of the investment project.