ACC - 6241 Problem - A tile manufacturer

TCO B) A tile manufacturer has supplied the following data: 
Boxes of tile produced and sold 625,000

Sales revenue $2,975,000

Variable manufacturing expense $1,720,000

Fixed manufacturing expense $790,000

Variable selling and admin expense $152,000

Fixed selling and admin expense $133,000

Net operating income $180,000

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?