1. If a project has $7,000 in estimated annual income over 8 years with an interest rate equal to 3%. What is the present value of this annuity?

2. If a project has an expense of $5,000 at the end of month 3, with a number of periods equal to 7 months and an interest rate equal to 8% per month. What is the present value of such an expense?

3. If a project has a machine whose acquisition cost is $12,000, with a useful life of 6 years and annual depreciation of $2,000, a number of periods equal to 15 years and an interest rate equal to 10%. Whereas the company will make the decision to sell the machine at the end of year 6. What would be the present value of the resale value?

4. If a project has equipment whose acquisition cost is $40,000, with a useful life of 10 years and annual depreciation of $4,000, annual operating and maintenance expenses of $1,000, a number of periods equal to 10 years and an interest rate equal to 5%. Whereas the company makes the decision to sell the equipment at the end of year 9. What would be the present value of the resale value?