Sunnybrook Farm is a local store that is currently open only Mondays through Saturdays.Sunnybrook is considering opening on Sundays. The annual incremental cost of sunday openings are estimates at $24,960. Sunnybrook Farms¨gross margin sale is 20 percent. Sunnybrook estimates that 60percent of its potencial Sunday sales to customers are now made on other days. What one day volumne of Sunday sales would be necessary for Sunnubrook Farm to attain the same weekly operationg income as in the current six day week?