Please answer with FORMULAS / EXPLANATION

Duve Corporation has provided the following contribution format income statement. Assume that the following information is within the relevant range. If the selling price increases by $4 per unit and the sales volume decreases by 200 units, the net operating income would be closest to: $7.200 $12,800 $10,400 $11,520 Timchak Corporation reports that at an activity level of 9,900 units, its total variable cost is $919,116 and its total fixed cost is $259,974. What would be the total cost, both fixed and variable, at an activity level of 10,100 units? Assume that this level of activity is within the relevant range. (Round intermediate caiculations to 2 decimal places.) $1,197,658 $1,191,000 $1,179,090 $1,202,910