please complete, find benefit to cost ratio using present worth method, estimated uniform annual worth method and future worth method

An equipment purchase is being considered by City of Dallas. The initial cost is determined to be $900,000. The future savings are estimated as shown in the following table. The interest rate is 12% annual. Cash Flows Year ($) 2 3 4 -900,000 200,000 200,000 200,000 200,000 200,000 300,000 6 a. Find The B/C ratio for this investment by using PW b. Find The B/C ratio for this investment by using EUAW c. Find The B/C ratio for this investment by using FW