Compute the present worth. thank you

Elena's Caf is investing in a new commercial refrigeration unit that will cost $40,000. They estimate that the unit will produce annual revenues of $12,000 for each of the next 6 years. The refrigeration unit will have negligible salvage value at the end of the next 6 years. Assuming a tax rate of 24%, a MACRS 5-year property class, 50% bonus depreciation, and an after-tax MARR of 8%, compute the present worth of the refrigeration unit and determine whether or not Elena's Caf should invest in the refrigeration unit