Radio Frequency Identification (RFID) is a technology used by drivers with speed passes at toll booths and ranchers who track livestock from farm to fork. Thrift-Mart is implementing the technology to track products within its stores. The RFID-tagged products will result in better inventory control and save the company $1.3 million per month beginning 3 months from now. How much can the company afford to spend now to implement the technology at an interest rate of 12% per year, compounded monthly, if it wants to recover its investment in 2 years? Also, write a spreadsheet function to display the answer.

I need to do this question in excel, but i don't know how to write the formula in excel.. please help me in detail..