A contractor is considering the following two alternatives:

1. Purchase a new computer system for $15,000. The system is expected to last 6 years with a salvage value of $1,000.
2. Lease a new computer system for $3,000 per year, payable in advance (at the start of the year). The system should last for 6 years.

Draw the cash flow diagram for the three different alternatives, identifying the values for P, A, and F as appropriate.