The Rutherford Company's costs and activity level for April and May are as follows: Activity level in units April 10,000 May 20,000 Variable costs $10,000 Fixed costs Mixed costs Total costs $60,000 $75,000 What are the estimated total costs for the month of June, assuming the estimated level of activity is 12,000? 30,000 20,000 Select one: A. $66,000