Accounting Midterm help

Need this back in 30 minutes or less 

Test is online but timed.

 A cement manufacturer has supplied the following data:

Tons of cement produced and sold                                  220,000

Sales revenue                                                               $924,000

Variable manufacturing expense                                    $297,000

Fixed manufacturing expense                                         $280,000

Variable selling and admin expense                                $165,000

Fixed selling and admin expense                                    $82,000

Net operating income                                                    $100,000

Required:

a. Calculate the company's unit contribution margin.

b. Calculate the company's contribution margin ratio.

c. If the company increases its unit sales volume by 5% without increasing its fixed expenses, what would the company's net operating income be?