Perform a benefit /cost analysis for the following usage-cost projects having the same life time of 20 years and interest rate of 5% by finding the incremental benefit/cost in steps one after the other. You have to write only the final value of incremental benefits/costs in the required field. The three projects have the following values, all calculated in AW form:

Project X : benefits = $3,196 and cost =$4,732

Project Y : benefits = $7,665 and cost =$6,166

Project Z : benefits = $3,837 and cost =$3,599