A department of Delta Company incurred the following costs for the month of June. Variable costs, and the variable portion of mixed costs, are a function of the number of units of activity:

Activity level in units	4,000
Variable costs	$ 8,200
Fixed costs	32,000
Mixed costs	14,710
Total costs	$ 54,910

During July, the activity level was 9,800 units, and the total costs incurred were $68,000.

Required:

1. Calculate the variable costs, fixed costs, and mixed costs incurred during July.
2. Use the highlow method to calculate the cost formula for mixed cost.