It is determined that a mobile application needed to support the Sales, Marketing, and Finance departments will cost $$60,000.$ The Sales department has $20$ employees and all employees will need the application. Likewise, all $10$ of the Marketing department employees will need the application. Only one$-$third of the Finance department is interested in the mobile application. The Finance department has $30$ employees. The CIO has decided to fund the mobile application using either the allocation method or chargeback method. Which funding method does each department wish the CIO will choose to use and why?