The 7th National Bank has two check-processing sites. Site 1 can process 10,000 checks per day, and site 2 can process 6000 checks per day. The bank processes three types of checks: vendor, salary, and personal. The processing cost per check depends on the site, as listed in the file P05_47.xlsx. Each day, 5000 checks of each type must be processed. Develop a network model to determine how to minimize the daily cost of processing checks.