Sonya showed the office manager at Arunden Solutions how he could pay for the new copier she was selling by bringing more of Arunden's printing jobs in-house, saving money that had previously been spent on local printers. Sonya is using to quantify the solution.

Cost-Benefit Analysis

Explanation:

The cost-benefit analysis is one of the process in which the company or an organizations are basically analyzing the decisions, projects, weakness and also the strengths for the purpose of determining the best way for achieving the various types of benefits and cost in the system.  The importance of the cost benefit analysis to that it helps in providing the various types of opportunities in the form of investing in the advertising campaign of the product.      

According to the given question, Sonya is using the Cost benefit analysis fr the purpose of quantifying the given solution based of the basis of given situation.  

 Therefore, Cost-benefit analysis is the correct answer.