How to find the NPV of these numbers and anyother calcuations possible.

New Combine $267,000

Finance rate 5.9%

Finance Term (YRS) 4

Payments (Overall) 8

Payment Frequency (YRS) 2

Old Combine Trade in Value Today $152,000

Old Combine Trade in Value in after 4 years $75,000

Annual Savings an Acre with New Combine $35

Number of Acres 4,000

Salaries (+ Benefits) $20

Gas $22.96

Maintenance with old combine $4,000

Maintenance with new combine $2,000

Payments (2 a year) $16,347