A firm is considering introducing a new product for which net return are expected to be - Year 1 to Year 3, inclusive $4000 per year - Year 4 to year 7, inclusive $8000 per year - Year 8 to year 13, inclusive $5000 per year To introduction of the product requires an immediate outlay of $25000 for equipment estimated to have a salvage value of $3500 after 13 years. write answer in basic method.