RGB Corporation has sales revenue of $171,000, variable expenses of $84,000, and fixed expenses of $39,000. If the company's sales volume increases by 20%, how will this change their operating income?

• A
• :
• Operating income will increase by $9,600.
• B
• :
• Operating income will increase by $65,400.
• C
• :
• Operating income will increase by 36.25%.
• D
• :
• Operating income will increase by 20%.