Groupe air uses two measures of activity, flights and passengers, in the cost formulas in its budgets and performance reports. the cost formula for plane operating costs is $36,230 per month plus $2,056 per flight plus $1 per passenger. the company expected its activity in october to be 83 flights and 233 passengers, but the actual activity was 82 flights and 238 passengers. the actual cost for plane operating costs in october was $198,000. the activity variance for plane operating costs in october would be closest to