To choose the best alternative among the given alternatives in the present worth analysis method when alternatives can be repeated at the end of their useful lives, it is necessary to: 5. Calculate the present worth of each alternative based on the useful lives if the useful lives are equal or using the LCM of the lives if the useful lives are different a. b. Calculate the present worth of each alternative using LCM of the lives if the useful lives are equal or using the longest live if the useful lives are different c. Calculate the present worth of each alternative based on its corresponding useful live if useful lives are different