4. A swimming pool is in need of major repairs. The pool cost $120,000 10 yrs ago. To overhaul now and extend its life 6 yrs would cost $40,000. A new pool costs $140,000 and has an estimated life of 12 yrs. Annual maintenance on the existing pool will be $10,000/yr, and $5,000 on the new pool. Salvage value on either pool is $20,000 regardless of age. i = 15%