A fаrm mаnаger is trying tо estimate the fixed cоsts assоciated with their crop production. The farm manager owns 500 acres of farmland that were purchased for $750 per acre in 1980, are currently worth $2,000 per acre (based on a market-basis balance sheet), and could be cash rented for $150 per acre. The current per-acre opportunity cost of the farmland is therefore best estimated as: