Need help with Net present value my answer is incorrect

Problem 24-3A (Part Level Submission) Brooks Clinic is considering investing in new heart-monitoring equipment. It has two options. Option A would have an initial lower cost but would require a significant expenditure for rebuilding after 4 years. Option B would require no rebuilding expenditure, but its maintenance costs would be higher. Since the Option B machine is of initial higher quality, it is expected to have a salvage value at the end of its useful life. The following estimates were made of the cash flows. The company's cost of capital is 5%. option Option B Initial cost Annual cash inflows Annual cash outflows Cost to rebuild (end of year$49,10 $196,000 $291,000 $72,500 $82,500 $28,000 $25,600 $0 $0 $8,500 7 years 7 years 0 4) Salvage value Estimated useful life