Project A requires an immediate investment of $8000 and another $6000 in three years. Net returns are $4000 after two years, $12 000 after four years, and $8000 after six years. Project B requires an immediate investment of $4000, another $6000 after two years, and $4000 after four years. Net returns are $3400 per year for seven years. Determine the net present value at 12%. Which project is preferable according to the net present value criterion?