A cement manufacturer has supplied the following data: Tons of cement produced and sold .... Sales revenue. Variable manufacturing expense.... Fixed manufacturing expense....... Variable selling and administrative expense Fixed selling and administrative expense..... Net operating income...... 260,000 $1,118,000 $429,000 $288,000 $91,000 $228,000 $82,000 Required: a. What is the company's unit contribution margin? b. What is the company's contribution margin ratio? c. If the company increases its unit sales volume by 3% without increasing its fixed expenses, what will total net operating income be