Owners of the 650 homes in a subdivision list their houses, on average, every six years. if a sales associate farms that neighborhood and lists 40% of the homes, how many homes can she expect to list this year

Joe pays ann to mow his lawn and ann mows vanna's lawn by mistake. vanna peers out her window and sees ann mowing, yet says nothing to ann about her mistake since vanna needs to have her lawn mowed. when ann approaches vanna for payment, vanna refuses, arguing that she never asked ann to mow her lawn. under these circumstances, ann can recover payment from vanna under: