Answer:
c. $195,800
Explanation:
The computation of the net income under variable costing is shown below:
Sales (18,000 × $30)                           $540,000
Less:  Variable production cost (18,000 ×  $12.90)   $232,200
Less: Variable Selling and administrative expenses ($90,000 × 60%) $54,000
Contribution margin                           $253,800
Less:  Fixed production costs (20,000 × $1.1)       $22,000
Less: Fixed selling and administrative expenses ($90,000 × 40%) $36,000
Net income                                           $195,800
Since 60% is variable and the remaining 40% is fixed. And, the same is taken for the computation part