How should the subject-verb agreement in this sentence be changed, if at all? Of all the students at my school, Mary were the only one who have received a national award. NO CHANGE were the only one who has is the only one who has was the only one who will have

The card shoppe needs to maintain 21 percent of its sales in net working capital. currently, the store is considering a four-year project that will increase sales from its current level of $349,000 to $408,000 the first year and to $414,000 a year for the following three years of the project. what amount should be included in the project analysis for net working capital in year 4 of the project?