AUS. Postal Service supervisor is looking for ways to reduce stress in the worting department. Wth the existing arrangement, stamped letters are machine-canceled and loaded into tubs with 425 letters per tub. The tubs are then pushed to postal dere who read and ley ap codes into an automated zoting machine at the ate of one tub per 250 seconds To overcome the stress caused when the samp canceling machine outpaces the sorting deles, a pull system is proposed. When the delle are ready to process another tub of mail they will pull the tub from the canceling machine area. How many tubs should circulate between the sorting clerks and the canceling machine if 110.000 letters are to be oned during a 6 hour thift, the safety stock policy van ablo, a iso 25. and the worage waong time plus matonat handling time is 60 minutes pat tub? The average processing time per tub of lettern .sday (Enter your response rounded to four decimal placha) The wetage waiting time pertub of letters . day (Enter your response rounded to bur decimal poo) There are the number of tube that should arculate between the woning ders and the canceling machine tubs (Ender your response rounded up to the next whole number)