How do I do these excel formulas?

Integrated Excel Problem 18-3 (Static) Based on Word problem 18-23 Better Finance (previously BillFloat), based in San Francisco, California, provides leasing and credit solutions to consumers and small businesses. If Better Finance wants to distribute $45,000 worth of overhead by sales, calculate the overhead expense for each department: Required: Using the information above compute the following: 1. Total sales 2. Ratio of each department's sales. 3. Overhead distributed to each department. Navigation: 1. Use the Open Excel in New Tab button to launch this question. 2. When finished in Excel, use the Save and Return to Assignment button in the lower right to return to Connect