The owners of a convenience store want to install a new vending machine so that customers can purchase soft drinks after hours. The machine costs $7600 to purchase and install and will require $220 worth of maintenance each year. Incremental sales related to the machine will amount to $1500 per year. Assume the discount rate is 9% and the machine has a life span of 20 years. What is the present value of the net operating cash flows? $13693 $25600 $11685 $7674